3-R-2R=-15

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Solution for 3-R-2R=-15 equation: 


Simplifying
3 + -1R + -2R = -15

Combine like terms: -1R + -2R = -3R
3 + -3R = -15

Solving
3 + -3R = -15

Solving for variable 'R'.

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

Add '-3' to each side of the equation.
3 + -3 + -3R = -15 + -3

Combine like terms: 3 + -3 = 0
0 + -3R = -15 + -3
-3R = -15 + -3

Combine like terms: -15 + -3 = -18
-3R = -18

Divide each side by '-3'.
R = 6

Simplifying
R = 6

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