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12=2x-8+3x
We move all terms to the left:
12-(2x-8+3x)=0
We add all the numbers together, and all the variables
-(5x-8)+12=0
We get rid of parentheses
-5x+8+12=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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