-1(r+3)=15

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Solution for -1(r+3)=15 equation: 


Simplifying
-1(r + 3) = 15

Reorder the terms:
-1(3 + r) = 15
(3 * -1 + r * -1) = 15
(-3 + -1r) = 15

Solving
-3 + -1r = 15

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + -1r = 15 + 3

Combine like terms: -3 + 3 = 0
0 + -1r = 15 + 3
-1r = 15 + 3

Combine like terms: 15 + 3 = 18
-1r = 18

Divide each side by '-1'.
r = -18

Simplifying
r = -18

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