15-r=4r

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Solution for 15-r=4r equation:


Simplifying
15 + -1r = 4r

Solving
15 + -1r = 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
15 + -1r + -4r = 4r + -4r

Combine like terms: -1r + -4r = -5r
15 + -5r = 4r + -4r

Combine like terms: 4r + -4r = 0
15 + -5r = 0

Add '-15' to each side of the equation.
15 + -15 + -5r = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -5r = 0 + -15
-5r = 0 + -15

Combine like terms: 0 + -15 = -15
-5r = -15

Divide each side by '-5'.
r = 3

Simplifying
r = 3

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