15=-9-4r

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Solution for 15=-9-4r equation:


Simplifying
15 = -9 + -4r

Solving
15 = -9 + -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 + 4r = -9 + -4r + 4r

Combine like terms: -4r + 4r = 0
15 + 4r = -9 + 0
15 + 4r = -9

Add '-15' to each side of the equation.
15 + -15 + 4r = -9 + -15

Combine like terms: 15 + -15 = 0
0 + 4r = -9 + -15
4r = -9 + -15

Combine like terms: -9 + -15 = -24
4r = -24

Divide each side by '4'.
r = -6

Simplifying
r = -6

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