-13=r-9

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Solution for -13=r-9 equation:


Simplifying
-13 = r + -9

Reorder the terms:
-13 = -9 + r

Solving
-13 = -9 + 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.
-13 + -1r = -9 + r + -1r

Combine like terms: r + -1r = 0
-13 + -1r = -9 + 0
-13 + -1r = -9

Add '13' to each side of the equation.
-13 + 13 + -1r = -9 + 13

Combine like terms: -13 + 13 = 0
0 + -1r = -9 + 13
-1r = -9 + 13

Combine like terms: -9 + 13 = 4
-1r = 4

Divide each side by '-1'.
r = -4

Simplifying
r = -4

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