r-40=-21

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Solution for r-40=-21 equation: 


Simplifying
r + -40 = -21

Reorder the terms:
-40 + r = -21

Solving
-40 + r = -21

Solving for variable 'r'.

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

Add '40' to each side of the equation.
-40 + 40 + r = -21 + 40

Combine like terms: -40 + 40 = 0
0 + r = -21 + 40
r = -21 + 40

Combine like terms: -21 + 40 = 19
r = 19

Simplifying
r = 19

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