-7(4+r)=21

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Solution for -7(4+r)=21 equation: 


Simplifying
-7(4 + r) = 21
(4 * -7 + r * -7) = 21
(-28 + -7r) = 21

Solving
-28 + -7r = 21

Solving for variable 'r'.

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

Add '28' to each side of the equation.
-28 + 28 + -7r = 21 + 28

Combine like terms: -28 + 28 = 0
0 + -7r = 21 + 28
-7r = 21 + 28

Combine like terms: 21 + 28 = 49
-7r = 49

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

Simplifying
r = -7

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