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15x-7+6x-15+4x+2=180
We move all terms to the left:
15x-7+6x-15+4x+2-(180)=0
We add all the numbers together, and all the variables
25x-200=0
We move all terms containing x to the left, all other terms to the right
25x=200
x=200/25
x=8
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