3r-42=21

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Solution for 3r-42=21 equation: 


Simplifying
3r + -42 = 21

Reorder the terms:
-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 = 63
3r = 63

Divide each side by '3'.
r = 21

Simplifying
r = 21

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