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-3x+5x=12+4
We move all terms to the left:
-3x+5x-(12+4)=0
We add all the numbers together, and all the variables
-3x+5x-16=0
We add all the numbers together, and all the variables
2x-16=0
We move all terms containing x to the left, all other terms to the right
2x=16
x=16/2
x=8
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