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(180-5x)+(160-4x)+(160-3x)=180
We move all terms to the left:
(180-5x)+(160-4x)+(160-3x)-(180)=0
We add all the numbers together, and all the variables
(-5x+180)+(-4x+160)+(-3x+160)-180=0
We get rid of parentheses
-5x-4x-3x+180+160+160-180=0
We add all the numbers together, and all the variables
-12x+320=0
We move all terms containing x to the left, all other terms to the right
-12x=-320
x=-320/-12
x=26+2/3
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