r-21=-15

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Solution for r-21=-15 equation: 


Simplifying
r + -21 = -15

Reorder the terms:
-21 + r = -15

Solving
-21 + r = -15

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + r = -15 + 21

Combine like terms: -21 + 21 = 0
0 + r = -15 + 21
r = -15 + 21

Combine like terms: -15 + 21 = 6
r = 6

Simplifying
r = 6

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