Question 120231
Given:
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{{{2x-7=0}}}
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To solve this equation for x, first get rid of the -7 on the left side. You can do that by
adding +7 to both sides. Adding +7 to the left side cancels the -7 on the left side and
the equation becomes:
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{{{2x = +7}}}
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Now solve for x by dividing both sides by 2 and you have:
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{{{x = 7/2 = 3.5}}}
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This means that x is always 3.5 ... so any point that has 3.5 for its x value will satisfy
the equation you were originally given.
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As examples, all of the following points would satisfy the original equation:
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(3.5, 10)
(3.5, 0)
(3.5, -15)
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because each of those points has an x value of 3.5
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How would the graph look on a coordinate system? 
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If you plotted the three points above (and any other point that has 3.5 as its value for x) 
the points would line up vertically through the point +3.5 on the x-axis, and the graph 
would look like:
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{{{graph(300,300,-2,5,-25,25,6000(x-3.5))}}}
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Hope this helps you to understand the problem.