y=y-20

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Solution for y=y-20 equation: 


Simplifying
y = y + -20

Reorder the terms:
y = -20 + y

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

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

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

Solving
0 = -20

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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