2r-R=15

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Solution for 2r-R=15 equation: 


Simplifying
2r + -1R = 15

Reorder the terms:
-1R + 2r = 15

Solving
-1R + 2r = 15

Solving for variable 'R'.

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

Add '-2r' to each side of the equation.
-1R + 2r + -2r = 15 + -2r

Combine like terms: 2r + -2r = 0
-1R + 0 = 15 + -2r
-1R = 15 + -2r

Divide each side by '-1'.
R = -15 + 2r

Simplifying
R = -15 + 2r

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