7(r+3)=42

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Solution for 7(r+3)=42 equation: 


Simplifying
7(r + 3) = 42

Reorder the terms:
7(3 + r) = 42
(3 * 7 + r * 7) = 42
(21 + 7r) = 42

Solving
21 + 7r = 42

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 = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 7r = 42 + -21
7r = 42 + -21

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

Divide each side by '7'.
r = 3

Simplifying
r = 3

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