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