SOLUTION: 3 times a certain number plus 7 = 30

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Question 286127: 3 times a certain number plus 7 = 30
Answer by PRMath(133) About Me  (Show Source):
You can put this solution on YOUR website!
3 times a certain number plus 7 = 30

Just break it down to what they give you:

3 times: This is like saying: 3+%2A+_%3F__
a certain number: This is a number we don't know so we'll call it "x"
plus 7: This is +%28____%2B+7%29
= 30

Put it all together: 3x + 7 = 30

Now solve for x like this:

3x+%2B+7+=+30
3x+=+30+-+7 (subtract 7 from both sides to isolate the "X")
3x+=+23 (30+-+7+=+23)
x+=+23%2F3 (divide both sides by 3 to isolate the "x" further)

Plug in our "x" info and see if the statement is correct:

3x+%2B+7+=+30 original equation
%283%29%2823%2F3%29+%2B+7+=+30 Plug 23%2F3 into the "x" variable of this equation.
23+%2B+7+=+30
30+=+30 Yayyyy it works. :-)

I hope this helps you. :-)