18-r=42

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Solution for 18-r=42 equation: 


Simplifying
18 + -1r = 42

Solving
18 + -1r = 42

Solving for variable 'r'.

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

Add '-18' to each side of the equation.
18 + -18 + -1r = 42 + -18

Combine like terms: 18 + -18 = 0
0 + -1r = 42 + -18
-1r = 42 + -18

Combine like terms: 42 + -18 = 24
-1r = 24

Divide each side by '-1'.
r = -24

Simplifying
r = -24

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