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9x=12x+75
We move all terms to the left:
9x-(12x+75)=0
We get rid of parentheses
9x-12x-75=0
We add all the numbers together, and all the variables
-3x-75=0
We move all terms containing x to the left, all other terms to the right
-3x=75
x=75/-3
x=-25
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