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5x-12+3=-10x
We move all terms to the left:
5x-12+3-(-10x)=0
We add all the numbers together, and all the variables
5x-(-10x)-9=0
We get rid of parentheses
5x+10x-9=0
We add all the numbers together, and all the variables
15x-9=0
We move all terms containing x to the left, all other terms to the right
15x=9
x=9/15
x=3/5
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