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(3x-1)+(4x-7)+90=180
We move all terms to the left:
(3x-1)+(4x-7)+90-(180)=0
We add all the numbers together, and all the variables
(3x-1)+(4x-7)-90=0
We get rid of parentheses
3x+4x-1-7-90=0
We add all the numbers together, and all the variables
7x-98=0
We move all terms containing x to the left, all other terms to the right
7x=98
x=98/7
x=14
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