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-12x-15=-10x-5
We move all terms to the left:
-12x-15-(-10x-5)=0
We get rid of parentheses
-12x+10x+5-15=0
We add all the numbers together, and all the variables
-2x-10=0
We move all terms containing x to the left, all other terms to the right
-2x=10
x=10/-2
x=-5
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