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90+(4x-1)+(5x+19)=180
We move all terms to the left:
90+(4x-1)+(5x+19)-(180)=0
We add all the numbers together, and all the variables
(4x-1)+(5x+19)-90=0
We get rid of parentheses
4x+5x-1+19-90=0
We add all the numbers together, and all the variables
9x-72=0
We move all terms containing x to the left, all other terms to the right
9x=72
x=72/9
x=8
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