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9x+7+4x-3+5x-4=180
We move all terms to the left:
9x+7+4x-3+5x-4-(180)=0
We add all the numbers together, and all the variables
18x-180=0
We move all terms containing x to the left, all other terms to the right
18x=180
x=180/18
x=10
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