20-4y=-20

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Solution for 20-4y=-20 equation: 


Simplifying
20 + -4y = -20

Solving
20 + -4y = -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 + -4y = -20 + -20

Combine like terms: 20 + -20 = 0
0 + -4y = -20 + -20
-4y = -20 + -20

Combine like terms: -20 + -20 = -40
-4y = -40

Divide each side by '-4'.
y = 10

Simplifying
y = 10

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