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2x+(x+3)+90=180
We move all terms to the left:
2x+(x+3)+90-(180)=0
We add all the numbers together, and all the variables
2x+(x+3)-90=0
We get rid of parentheses
2x+x+3-90=0
We add all the numbers together, and all the variables
3x-87=0
We move all terms containing x to the left, all other terms to the right
3x=87
x=87/3
x=29
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