15=y+r

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Solution for 15=y+r equation:


Simplifying
15 = y + r

Reorder the terms:
15 = r + y

Solving
15 = r + y

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 = r + -1r + y

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

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

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

Divide each side by '-1'.
r = 15 + -1y

Simplifying
r = 15 + -1y

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