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(10x)+(21x-6)=180
We move all terms to the left:
(10x)+(21x-6)-(180)=0
We get rid of parentheses
10x+21x-6-180=0
We add all the numbers together, and all the variables
31x-186=0
We move all terms containing x to the left, all other terms to the right
31x=186
x=186/31
x=6
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