r-1=-18

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Solution for r-1=-18 equation: 


Simplifying
r + -1 = -18

Reorder the terms:
-1 + r = -18

Solving
-1 + r = -18

Solving for variable 'r'.

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

Add '1' to each side of the equation.
-1 + 1 + r = -18 + 1

Combine like terms: -1 + 1 = 0
0 + r = -18 + 1
r = -18 + 1

Combine like terms: -18 + 1 = -17
r = -17

Simplifying
r = -17

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