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12+54x+10=15x-20+45x
We move all terms to the left:
12+54x+10-(15x-20+45x)=0
We add all the numbers together, and all the variables
54x-(60x-20)+12+10=0
We add all the numbers together, and all the variables
54x-(60x-20)+22=0
We get rid of parentheses
54x-60x+20+22=0
We add all the numbers together, and all the variables
-6x+42=0
We move all terms containing x to the left, all other terms to the right
-6x=-42
x=-42/-6
x=+7
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