7(3+r)=140

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Solution for 7(3+r)=140 equation: 


Simplifying
7(3 + r) = 140
(3 * 7 + r * 7) = 140
(21 + 7r) = 140

Solving
21 + 7r = 140

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 = 140 + -21

Combine like terms: 21 + -21 = 0
0 + 7r = 140 + -21
7r = 140 + -21

Combine like terms: 140 + -21 = 119
7r = 119

Divide each side by '7'.
r = 17

Simplifying
r = 17

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