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7x+4x-4=8x+20
We move all terms to the left:
7x+4x-4-(8x+20)=0
We add all the numbers together, and all the variables
11x-(8x+20)-4=0
We get rid of parentheses
11x-8x-20-4=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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