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-1=15-2x
Multiply both sides of the equation by 6, the least common multiple of 6,2,3.
15-2x=-1
Swap sides so that all variable terms are on the left hand side.
-2x=-1-15
Subtract 15 from both sides.
-2x=-16
Subtract 15 from -1 to get -16.
x=\frac{-16}{-2}
Divide both sides by -2.
x=8
Divide -16 by -2 to get 8.