R*3+2r=-21

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Solution for R*3+2r=-21 equation: 


Simplifying
R * 3 + 2r = -21

Reorder the terms for easier multiplication:
3R + 2r = -21

Solving
3R + 2r = -21

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.
3R + 2r + -2r = -21 + -2r

Combine like terms: 2r + -2r = 0
3R + 0 = -21 + -2r
3R = -21 + -2r

Divide each side by '3'.
R = -7 + -0.6666666667r

Simplifying
R = -7 + -0.6666666667r

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