r-31=-18

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Solution for r-31=-18 equation: 


Simplifying
r + -31 = -18

Reorder the terms:
-31 + r = -18

Solving
-31 + r = -18

Solving for variable 'r'.

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

Add '31' to each side of the equation.
-31 + 31 + r = -18 + 31

Combine like terms: -31 + 31 = 0
0 + r = -18 + 31
r = -18 + 31

Combine like terms: -18 + 31 = 13
r = 13

Simplifying
r = 13

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