7-2y=21

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Solution for 7-2y=21 equation: 


Simplifying
7 + -2y = 21

Solving
7 + -2y = 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 + -2y = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -2y = 21 + -7
-2y = 21 + -7

Combine like terms: 21 + -7 = 14
-2y = 14

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

Simplifying
y = -7

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