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4x-27+5x-16+7x+28=177
We move all terms to the left:
4x-27+5x-16+7x+28-(177)=0
We add all the numbers together, and all the variables
16x-192=0
We move all terms containing x to the left, all other terms to the right
16x=192
x=192/16
x=12
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