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(7x+1)+90+(9x-7)=180
We move all terms to the left:
(7x+1)+90+(9x-7)-(180)=0
We add all the numbers together, and all the variables
(7x+1)+(9x-7)-90=0
We get rid of parentheses
7x+9x+1-7-90=0
We add all the numbers together, and all the variables
16x-96=0
We move all terms containing x to the left, all other terms to the right
16x=96
x=96/16
x=6
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