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12x+4+8x+8=12x+20
We move all terms to the left:
12x+4+8x+8-(12x+20)=0
We add all the numbers together, and all the variables
20x-(12x+20)+12=0
We get rid of parentheses
20x-12x-20+12=0
We add all the numbers together, and all the variables
8x-8=0
We move all terms containing x to the left, all other terms to the right
8x=8
x=8/8
x=1
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