15=-7+2(r-9)

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Solution for 15=-7+2(r-9) equation:


Simplifying
15 = -7 + 2(r + -9)

Reorder the terms:
15 = -7 + 2(-9 + r)
15 = -7 + (-9 * 2 + r * 2)
15 = -7 + (-18 + 2r)

Combine like terms: -7 + -18 = -25
15 = -25 + 2r

Solving
15 = -25 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
15 + -2r = -25 + 2r + -2r

Combine like terms: 2r + -2r = 0
15 + -2r = -25 + 0
15 + -2r = -25

Add '-15' to each side of the equation.
15 + -15 + -2r = -25 + -15

Combine like terms: 15 + -15 = 0
0 + -2r = -25 + -15
-2r = -25 + -15

Combine like terms: -25 + -15 = -40
-2r = -40

Divide each side by '-2'.
r = 20

Simplifying
r = 20

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