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90+x+(3x+10)=180
We move all terms to the left:
90+x+(3x+10)-(180)=0
We add all the numbers together, and all the variables
x+(3x+10)-90=0
We get rid of parentheses
x+3x+10-90=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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