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7-9x-3=-75+4x-12
We move all terms to the left:
7-9x-3-(-75+4x-12)=0
We add all the numbers together, and all the variables
-9x-(4x-87)+7-3=0
We add all the numbers together, and all the variables
-9x-(4x-87)+4=0
We get rid of parentheses
-9x-4x+87+4=0
We add all the numbers together, and all the variables
-13x+91=0
We move all terms containing x to the left, all other terms to the right
-13x=-91
x=-91/-13
x=+7
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