r+15=87

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Solution for r+15=87 equation: 


Simplifying
r + 15 = 87

Reorder the terms:
15 + r = 87

Solving
15 + r = 87

Solving for variable 'r'.

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

Add '-15' to each side of the equation.
15 + -15 + r = 87 + -15

Combine like terms: 15 + -15 = 0
0 + r = 87 + -15
r = 87 + -15

Combine like terms: 87 + -15 = 72
r = 72

Simplifying
r = 72

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