15=10-r

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Solution for 15=10-r equation:


Simplifying
15 = 10 + -1r

Solving
15 = 10 + -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 = 10 + -1r + r

Combine like terms: -1r + r = 0
15 + r = 10 + 0
15 + r = 10

Add '-15' to each side of the equation.
15 + -15 + r = 10 + -15

Combine like terms: 15 + -15 = 0
0 + r = 10 + -15
r = 10 + -15

Combine like terms: 10 + -15 = -5
r = -5

Simplifying
r = -5

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