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3x+4=5x+-20
We move all terms to the left:
3x+4-(5x+-20)=0
We add all the numbers together, and all the variables
3x-(5x-20)+4=0
We get rid of parentheses
3x-5x+20+4=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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