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13x-5=8-12+15x
Combine 3x and 10x to get 13x.
13x-5=-4+15x
Subtract 12 from 8 to get -4.
13x-5-15x=-4
Subtract 15x from both sides.
-2x-5=-4
Combine 13x and -15x to get -2x.
-2x=-4+5
Add 5 to both sides.
-2x=1
Add -4 and 5 to get 1.
x=\frac{1}{-2}
Divide both sides by -2.
x=-\frac{1}{2}
Fraction \frac{1}{-2} can be rewritten as -\frac{1}{2} by extracting the negative sign.