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90+(3x+4)=180
We move all terms to the left:
90+(3x+4)-(180)=0
We add all the numbers together, and all the variables
(3x+4)-90=0
We get rid of parentheses
3x+4-90=0
We add all the numbers together, and all the variables
3x-86=0
We move all terms containing x to the left, all other terms to the right
3x=86
x=86/3
x=28+2/3
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