21r=87+2r

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Solution for 21r=87+2r equation: 


Simplifying
21r = 87 + 2r

Solving
21r = 87 + 2r

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.
21r + -2r = 87 + 2r + -2r

Combine like terms: 21r + -2r = 19r
19r = 87 + 2r + -2r

Combine like terms: 2r + -2r = 0
19r = 87 + 0
19r = 87

Divide each side by '19'.
r = 4.578947368

Simplifying
r = 4.578947368

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