-3=r-13

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Solution for -3=r-13 equation:


Simplifying
-3 = r + -13

Reorder the terms:
-3 = -13 + r

Solving
-3 = -13 + 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 = -13 + r + -1r

Combine like terms: r + -1r = 0
-3 + -1r = -13 + 0
-3 + -1r = -13

Add '3' to each side of the equation.
-3 + 3 + -1r = -13 + 3

Combine like terms: -3 + 3 = 0
0 + -1r = -13 + 3
-1r = -13 + 3

Combine like terms: -13 + 3 = -10
-1r = -10

Divide each side by '-1'.
r = 10

Simplifying
r = 10

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