R+2+2r=-21

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


Simplifying
R + 2 + 2r = -21

Reorder the terms:
2 + R + 2r = -21

Solving
2 + R + 2r = -21

Solving for variable 'R'.

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

Add '-2' to each side of the equation.
2 + R + -2 + 2r = -21 + -2

Reorder the terms:
2 + -2 + R + 2r = -21 + -2

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

Combine like terms: -21 + -2 = -23
R + 2r = -23

Add '-2r' to each side of the equation.
R + 2r + -2r = -23 + -2r

Combine like terms: 2r + -2r = 0
R + 0 = -23 + -2r
R = -23 + -2r

Simplifying
R = -23 + -2r

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