r+3+12=-1

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Solution for r+3+12=-1 equation: 


Simplifying
r + 3 + 12 = -1

Reorder the terms:
3 + 12 + r = -1

Combine like terms: 3 + 12 = 15
15 + r = -1

Solving
15 + r = -1

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 = -1 + -15

Combine like terms: 15 + -15 = 0
0 + r = -1 + -15
r = -1 + -15

Combine like terms: -1 + -15 = -16
r = -16

Simplifying
r = -16

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