-31=r-20

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Solution for -31=r-20 equation:


Simplifying
-31 = r + -20

Reorder the terms:
-31 = -20 + r

Solving
-31 = -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.
-31 + -1r = -20 + r + -1r

Combine like terms: r + -1r = 0
-31 + -1r = -20 + 0
-31 + -1r = -20

Add '31' to each side of the equation.
-31 + 31 + -1r = -20 + 31

Combine like terms: -31 + 31 = 0
0 + -1r = -20 + 31
-1r = -20 + 31

Combine like terms: -20 + 31 = 11
-1r = 11

Divide each side by '-1'.
r = -11

Simplifying
r = -11

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