-5y+2y=21

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Solution for -5y+2y=21 equation: 


Simplifying
-5y + 2y = 21

Combine like terms: -5y + 2y = -3y
-3y = 21

Solving
-3y = 21

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Divide each side by '-3'.
y = -7

Simplifying
y = -7

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