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12x+10-15x=x-2-x
We move all terms to the left:
12x+10-15x-(x-2-x)=0
We add all the numbers together, and all the variables
12x-15x+10-(-2)=0
We add all the numbers together, and all the variables
-3x+12=0
We move all terms containing x to the left, all other terms to the right
-3x=-12
x=-12/-3
x=+4
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