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x+(x-22)+90+x+(x-22)+90=720
We move all terms to the left:
x+(x-22)+90+x+(x-22)+90-(720)=0
We add all the numbers together, and all the variables
2x+(x-22)+(x-22)-540=0
We get rid of parentheses
2x+x+x-22-22-540=0
We add all the numbers together, and all the variables
4x-584=0
We move all terms containing x to the left, all other terms to the right
4x=584
x=584/4
x=146
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