15=r-6

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Solution for 15=r-6 equation:


Simplifying
15 = r + -6

Reorder the terms:
15 = -6 + r

Solving
15 = -6 + 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.
15 + -1r = -6 + r + -1r

Combine like terms: r + -1r = 0
15 + -1r = -6 + 0
15 + -1r = -6

Add '-15' to each side of the equation.
15 + -15 + -1r = -6 + -15

Combine like terms: 15 + -15 = 0
0 + -1r = -6 + -15
-1r = -6 + -15

Combine like terms: -6 + -15 = -21
-1r = -21

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

Simplifying
r = 21

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