15=9-r

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Solution for 15=9-r equation:


Simplifying
15 = 9 + -1r

Solving
15 = 9 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
15 + r = 9 + -1r + r

Combine like terms: -1r + r = 0
15 + r = 9 + 0
15 + r = 9

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

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

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

Simplifying
r = -6

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