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3x-5x=-8-4
We move all terms to the left:
3x-5x-(-8-4)=0
We add all the numbers together, and all the variables
3x-5x-(-12)=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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