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12x+8x-4=19x+8
We move all terms to the left:
12x+8x-4-(19x+8)=0
We add all the numbers together, and all the variables
20x-(19x+8)-4=0
We get rid of parentheses
20x-19x-8-4=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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