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x+20+(x+20)-18+x=88
We move all terms to the left:
x+20+(x+20)-18+x-(88)=0
We add all the numbers together, and all the variables
2x+(x+20)-86=0
We get rid of parentheses
2x+x+20-86=0
We add all the numbers together, and all the variables
3x-66=0
We move all terms containing x to the left, all other terms to the right
3x=66
x=66/3
x=22
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