-4[2-r]=28

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Solution for -4[2-r]=28 equation: 


Simplifying
-4[2 + -1r] = 28
[2 * -4 + -1r * -4] = 28
[-8 + 4r] = 28

Solving
-8 + 4r = 28

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + 4r = 28 + 8

Combine like terms: -8 + 8 = 0
0 + 4r = 28 + 8
4r = 28 + 8

Combine like terms: 28 + 8 = 36
4r = 36

Divide each side by '4'.
r = 9

Simplifying
r = 9

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