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9x-(x+7)=25
We move all terms to the left:
9x-(x+7)-(25)=0
We get rid of parentheses
9x-x-7-25=0
We add all the numbers together, and all the variables
8x-32=0
We move all terms containing x to the left, all other terms to the right
8x=32
x=32/8
x=4
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