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3x+4+108=8x-28
We move all terms to the left:
3x+4+108-(8x-28)=0
We add all the numbers together, and all the variables
3x-(8x-28)+112=0
We get rid of parentheses
3x-8x+28+112=0
We add all the numbers together, and all the variables
-5x+140=0
We move all terms containing x to the left, all other terms to the right
-5x=-140
x=-140/-5
x=+28
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