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100+8x=180+4x
We move all terms to the left:
100+8x-(180+4x)=0
We add all the numbers together, and all the variables
8x-(4x+180)+100=0
We get rid of parentheses
8x-4x-180+100=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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