-21=.42*R

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Solution for -21=.42*R equation:


Simplifying
-21 = 0.42R

Solving
-21 = 0.42R

Solving for variable 'R'.

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

Add '-0.42R' to each side of the equation.
-21 + -0.42R = 0.42R + -0.42R

Combine like terms: 0.42R + -0.42R = 0.00
-21 + -0.42R = 0.00

Add '21' to each side of the equation.
-21 + 21 + -0.42R = 0.00 + 21

Combine like terms: -21 + 21 = 0
0 + -0.42R = 0.00 + 21
-0.42R = 0.00 + 21

Combine like terms: 0.00 + 21 = 21
-0.42R = 21

Divide each side by '-0.42'.
R = -50

Simplifying
R = -50

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