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7x-12+4x+12+10x+12=180
We move all terms to the left:
7x-12+4x+12+10x+12-(180)=0
We add all the numbers together, and all the variables
21x-168=0
We move all terms containing x to the left, all other terms to the right
21x=168
x=168/21
x=8
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