-y+21=r

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Solution for -y+21=r equation:


Simplifying
-1y + 21 = r

Reorder the terms:
21 + -1y = r

Solving
21 + -1y = r

Solving for variable 'y'.

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

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

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

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

Simplifying
y = 21 + -1r

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