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12x-5x+145=12x+75
We move all terms to the left:
12x-5x+145-(12x+75)=0
We add all the numbers together, and all the variables
7x-(12x+75)+145=0
We get rid of parentheses
7x-12x-75+145=0
We add all the numbers together, and all the variables
-5x+70=0
We move all terms containing x to the left, all other terms to the right
-5x=-70
x=-70/-5
x=+14
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