Solve for y
y=10
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10-y-y=-10
Subtract y from both sides.
10-2y=-10
Combine -y and -y to get -2y.
-2y=-10-10
Subtract 10 from both sides.
-2y=-20
Subtract 10 from -10 to get -20.
y=\frac{-20}{-2}
Divide both sides by -2.
y=10
Divide -20 by -2 to get 10.
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