21y-20y+20=-20

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Solution for 21y-20y+20=-20 equation: 


Simplifying
21y + -20y + 20 = -20

Reorder the terms:
20 + 21y + -20y = -20

Combine like terms: 21y + -20y = 1y
20 + 1y = -20

Solving
20 + 1y = -20

Solving for variable 'y'.

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

Add '-20' to each side of the equation.
20 + -20 + 1y = -20 + -20

Combine like terms: 20 + -20 = 0
0 + 1y = -20 + -20
1y = -20 + -20

Combine like terms: -20 + -20 = -40
1y = -40

Divide each side by '1'.
y = -40

Simplifying
y = -40

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