7(r-3)=21

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Solution for 7(r-3)=21 equation: 


Simplifying
7(r + -3) = 21

Reorder the terms:
7(-3 + r) = 21
(-3 * 7 + r * 7) = 21
(-21 + 7r) = 21

Solving
-21 + 7r = 21

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 7r = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 7r = 21 + 21
7r = 21 + 21

Combine like terms: 21 + 21 = 42
7r = 42

Divide each side by '7'.
r = 6

Simplifying
r = 6

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