Solve for y
y=57
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-36=21-y
Multiply both sides of the equation by 3.
21-y=-36
Swap sides so that all variable terms are on the left hand side.
-y=-36-21
Subtract 21 from both sides.
-y=-57
Subtract 21 from -36 to get -57.
y=57
Multiply both sides by -1.
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Limits
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