-39=-18-r

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Solution for -39=-18-r equation:


Simplifying
-39 = -18 + -1r

Solving
-39 = -18 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-39 + r = -18 + -1r + r

Combine like terms: -1r + r = 0
-39 + r = -18 + 0
-39 + r = -18

Add '39' to each side of the equation.
-39 + 39 + r = -18 + 39

Combine like terms: -39 + 39 = 0
0 + r = -18 + 39
r = -18 + 39

Combine like terms: -18 + 39 = 21
r = 21

Simplifying
r = 21

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