-7(3+r)=28

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Solution for -7(3+r)=28 equation: 


Simplifying
-7(3 + r) = 28
(3 * -7 + r * -7) = 28
(-21 + -7r) = 28

Solving
-21 + -7r = 28

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 = 28 + 21

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

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

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

Simplifying
r = -7

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