SOLUTION: 3(x+7)=7x-15 Please show all work

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Question 220338: 3(x+7)=7x-15 Please show all work
Answer by rfer(16322) About Me  (Show Source):
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3(x+7)=7x-15
3x+21=7x-15
subtract 3x
21=2x-15
add 15
36=2x
divide by 2
x=18