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90+3x+(4x-1)=180
We move all terms to the left:
90+3x+(4x-1)-(180)=0
We add all the numbers together, and all the variables
3x+(4x-1)-90=0
We get rid of parentheses
3x+4x-1-90=0
We add all the numbers together, and all the variables
7x-91=0
We move all terms containing x to the left, all other terms to the right
7x=91
x=91/7
x=13
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