3=r-18

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Solution for 3=r-18 equation:


Simplifying
3 = r + -18

Reorder the terms:
3 = -18 + r

Solving
3 = -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.
3 + -1r = -18 + r + -1r

Combine like terms: r + -1r = 0
3 + -1r = -18 + 0
3 + -1r = -18

Add '-3' to each side of the equation.
3 + -3 + -1r = -18 + -3

Combine like terms: 3 + -3 = 0
0 + -1r = -18 + -3
-1r = -18 + -3

Combine like terms: -18 + -3 = -21
-1r = -21

Divide each side by '-1'.
r = 21

Simplifying
r = 21

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