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112+180-2x+180-2x+12=180
We move all terms to the left:
112+180-2x+180-2x+12-(180)=0
We add all the numbers together, and all the variables
-4x+304=0
We move all terms containing x to the left, all other terms to the right
-4x=-304
x=-304/-4
x=+76
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