8=r+15

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Solution for 8=r+15 equation: 


Simplifying
8 = r + 15

Reorder the terms:
8 = 15 + r

Solving
8 = 15 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
8 + -1r = 15 + r + -1r

Combine like terms: r + -1r = 0
8 + -1r = 15 + 0
8 + -1r = 15

Add '-8' to each side of the equation.
8 + -8 + -1r = 15 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 15 + -8
-1r = 15 + -8

Combine like terms: 15 + -8 = 7
-1r = 7

Divide each side by '-1'.
r = -7

Simplifying
r = -7

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