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90+2x+(3x-20)=180
We move all terms to the left:
90+2x+(3x-20)-(180)=0
We add all the numbers together, and all the variables
2x+(3x-20)-90=0
We get rid of parentheses
2x+3x-20-90=0
We add all the numbers together, and all the variables
5x-110=0
We move all terms containing x to the left, all other terms to the right
5x=110
x=110/5
x=22
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