15=r(1.15+1.25)

Solution for 15=r(1.15+1.25) equation:

Simplifying
15 = r(1.15 + 1.25)

Combine like terms: 1.15 + 1.25 = 2.4
15 = r(2.4)

Reorder the terms for easier multiplication:
15 = 2.4r

Solving
15 = 2.4r

Solving for variable 'r'.

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

Add '-2.4r' to each side of the equation.
15 + -2.4r = 2.4r + -2.4r

Combine like terms: 2.4r + -2.4r = 0.0
15 + -2.4r = 0.0

Add '-15' to each side of the equation.
15 + -15 + -2.4r = 0.0 + -15

Combine like terms: 15 + -15 = 0
0 + -2.4r = 0.0 + -15
-2.4r = 0.0 + -15

Combine like terms: 0.0 + -15 = -15
-2.4r = -15

Divide each side by '-2.4'.
r = 6.25

Simplifying
r = 6.25