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90+90+(2x+4)+(3x-9)=360
We move all terms to the left:
90+90+(2x+4)+(3x-9)-(360)=0
We add all the numbers together, and all the variables
(2x+4)+(3x-9)-180=0
We get rid of parentheses
2x+3x+4-9-180=0
We add all the numbers together, and all the variables
5x-185=0
We move all terms containing x to the left, all other terms to the right
5x=185
x=185/5
x=37
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