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12x+4+10x=20x+20
We move all terms to the left:
12x+4+10x-(20x+20)=0
We add all the numbers together, and all the variables
22x-(20x+20)+4=0
We get rid of parentheses
22x-20x-20+4=0
We add all the numbers together, and all the variables
2x-16=0
We move all terms containing x to the left, all other terms to the right
2x=16
x=16/2
x=8
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