28-r=15

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Solution for 28-r=15 equation: 


Simplifying
28 + -1r = 15

Solving
28 + -1r = 15

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-28' to each side of the equation.
28 + -28 + -1r = 15 + -28

Combine like terms: 28 + -28 = 0
0 + -1r = 15 + -28
-1r = 15 + -28

Combine like terms: 15 + -28 = -13
-1r = -13

Divide each side by '-1'.
r = 13

Simplifying
r = 13

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