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90+(3x)+(2x+5)=180
We move all terms to the left:
90+(3x)+(2x+5)-(180)=0
We add all the numbers together, and all the variables
3x+(2x+5)-90=0
We get rid of parentheses
3x+2x+5-90=0
We add all the numbers together, and all the variables
5x-85=0
We move all terms containing x to the left, all other terms to the right
5x=85
x=85/5
x=17
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