-15=9+6(r-8)

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Solution for -15=9+6(r-8) equation:


Simplifying
-15 = 9 + 6(r + -8)

Reorder the terms:
-15 = 9 + 6(-8 + r)
-15 = 9 + (-8 * 6 + r * 6)
-15 = 9 + (-48 + 6r)

Combine like terms: 9 + -48 = -39
-15 = -39 + 6r

Solving
-15 = -39 + 6r

Solving for variable 'r'.

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

Add '-6r' to each side of the equation.
-15 + -6r = -39 + 6r + -6r

Combine like terms: 6r + -6r = 0
-15 + -6r = -39 + 0
-15 + -6r = -39

Add '15' to each side of the equation.
-15 + 15 + -6r = -39 + 15

Combine like terms: -15 + 15 = 0
0 + -6r = -39 + 15
-6r = -39 + 15

Combine like terms: -39 + 15 = -24
-6r = -24

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

Simplifying
r = 4

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