-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 = 56
-7r = 56

Divide each side by '-7'.
r = -8

Simplifying
r = -8

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