Solve for y
y=40
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y+20-2y=-20
Subtract 2y from both sides.
-y+20=-20
Combine y and -2y to get -y.
-y=-20-20
Subtract 20 from both sides.
-y=-40
Subtract 20 from -20 to get -40.
y=40
Multiply both sides by -1.
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