42-3r=21

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Solution for 42-3r=21 equation: 


Simplifying
42 + -3r = 21

Solving
42 + -3r = 21

Solving for variable 'r'.

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

Add '-42' to each side of the equation.
42 + -42 + -3r = 21 + -42

Combine like terms: 42 + -42 = 0
0 + -3r = 21 + -42
-3r = 21 + -42

Combine like terms: 21 + -42 = -21
-3r = -21

Divide each side by '-3'.
r = 7

Simplifying
r = 7

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