18=r-20

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Solution for 18=r-20 equation:


Simplifying
18 = r + -20

Reorder the terms:
18 = -20 + r

Solving
18 = -20 + 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.
18 + -1r = -20 + r + -1r

Combine like terms: r + -1r = 0
18 + -1r = -20 + 0
18 + -1r = -20

Add '-18' to each side of the equation.
18 + -18 + -1r = -20 + -18

Combine like terms: 18 + -18 = 0
0 + -1r = -20 + -18
-1r = -20 + -18

Combine like terms: -20 + -18 = -38
-1r = -38

Divide each side by '-1'.
r = 38

Simplifying
r = 38

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