R+4+2r=-21

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Solution for R+4+2r=-21 equation:


Simplifying
R + 4 + 2r = -21

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

Solving
4 + R + 2r = -21

Solving for variable 'R'.

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

Add '-4' to each side of the equation.
4 + R + -4 + 2r = -21 + -4

Reorder the terms:
4 + -4 + R + 2r = -21 + -4

Combine like terms: 4 + -4 = 0
0 + R + 2r = -21 + -4
R + 2r = -21 + -4

Combine like terms: -21 + -4 = -25
R + 2r = -25

Add '-2r' to each side of the equation.
R + 2r + -2r = -25 + -2r

Combine like terms: 2r + -2r = 0
R + 0 = -25 + -2r
R = -25 + -2r

Simplifying
R = -25 + -2r

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