15=8+r

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Solution for 15=8+r equation:


Simplifying
15 = 8 + r

Solving
15 = 8 + 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.
15 + -1r = 8 + r + -1r

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

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

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

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

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

Simplifying
r = 7

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