SOLUTION: 5x+(180-x)=300

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Question 208370: 5x+(180-x)=300
Answer by rfer(16322) About Me  (Show Source):
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5x+(180-x)=300
5x+180-x=300
subtract 180 from both sides
5x+180-180-x=300-180
5x-x=120
combine
4x=120
x=30