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180-9-4x-26+4x+43+2x-12=180
We move all terms to the left:
180-9-4x-26+4x+43+2x-12-(180)=0
We add all the numbers together, and all the variables
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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