7(5+r)=21

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Solution for 7(5+r)=21 equation:


Simplifying
7(5 + r) = 21
(5 * 7 + r * 7) = 21
(35 + 7r) = 21

Solving
35 + 7r = 21

Solving for variable 'r'.

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

Add '-35' to each side of the equation.
35 + -35 + 7r = 21 + -35

Combine like terms: 35 + -35 = 0
0 + 7r = 21 + -35
7r = 21 + -35

Combine like terms: 21 + -35 = -14
7r = -14

Divide each side by '7'.
r = -2

Simplifying
r = -2

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