20=y-1

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Solution for 20=y-1 equation:


Simplifying
20 = y + -1

Reorder the terms:
20 = -1 + y

Solving
20 = -1 + y

Solving for variable 'y'.

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

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

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

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

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

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

Divide each side by '-1'.
y = 21

Simplifying
y = 21

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