7-5y-2y=21

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Solution for 7-5y-2y=21 equation: 


Simplifying
7 + -5y + -2y = 21

Combine like terms: -5y + -2y = -7y
7 + -7y = 21

Solving
7 + -7y = 21

Solving for variable 'y'.

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

Add '-7' to each side of the equation.
7 + -7 + -7y = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -7y = 21 + -7
-7y = 21 + -7

Combine like terms: 21 + -7 = 14
-7y = 14

Divide each side by '-7'.
y = -2

Simplifying
y = -2

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