72=r-18

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Solution for 72=r-18 equation:


Simplifying
72 = r + -18

Reorder the terms:
72 = -18 + r

Solving
72 = -18 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
72 + -1r = -18 + r + -1r

Combine like terms: r + -1r = 0
72 + -1r = -18 + 0
72 + -1r = -18

Add '-72' to each side of the equation.
72 + -72 + -1r = -18 + -72

Combine like terms: 72 + -72 = 0
0 + -1r = -18 + -72
-1r = -18 + -72

Combine like terms: -18 + -72 = -90
-1r = -90

Divide each side by '-1'.
r = 90

Simplifying
r = 90

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