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3x+(2x+45)+(4x-40)+(x+55)=360
We move all terms to the left:
3x+(2x+45)+(4x-40)+(x+55)-(360)=0
We get rid of parentheses
3x+2x+4x+x+45-40+55-360=0
We add all the numbers together, and all the variables
10x-300=0
We move all terms containing x to the left, all other terms to the right
10x=300
x=300/10
x=30
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