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155+57+(x+61)+(-3x+13)+(x+65)=360
We move all terms to the left:
155+57+(x+61)+(-3x+13)+(x+65)-(360)=0
We add all the numbers together, and all the variables
(x+61)+(-3x+13)+(x+65)-148=0
We get rid of parentheses
x-3x+x+61+13+65-148=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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