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(4x+70)+(2x+100)=180
We move all terms to the left:
(4x+70)+(2x+100)-(180)=0
We get rid of parentheses
4x+2x+70+100-180=0
We add all the numbers together, and all the variables
6x-10=0
We move all terms containing x to the left, all other terms to the right
6x=10
x=10/6
x=1+2/3
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