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(8x-1)+4x+7)+90=180
We move all terms to the left:
(8x-1)+4x+7)+90-(180)=0
We add all the numbers together, and all the variables
4x+(8x-1)=0
We get rid of parentheses
4x+8x-1=0
We add all the numbers together, and all the variables
12x-1=0
We move all terms containing x to the left, all other terms to the right
12x=1
x=1/12
x=1/12
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