10=y-21

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Solution for 10=y-21 equation:


Simplifying
10 = y + -21

Reorder the terms:
10 = -21 + y

Solving
10 = -21 + 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.
10 + -1y = -21 + y + -1y

Combine like terms: y + -1y = 0
10 + -1y = -21 + 0
10 + -1y = -21

Add '-10' to each side of the equation.
10 + -10 + -1y = -21 + -10

Combine like terms: 10 + -10 = 0
0 + -1y = -21 + -10
-1y = -21 + -10

Combine like terms: -21 + -10 = -31
-1y = -31

Divide each side by '-1'.
y = 31

Simplifying
y = 31

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