4(-1+r)=28

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Solution for 4(-1+r)=28 equation: 


Simplifying
4(-1 + r) = 28
(-1 * 4 + r * 4) = 28
(-4 + 4r) = 28

Solving
-4 + 4r = 28

Solving for variable 'r'.

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

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

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

Combine like terms: 28 + 4 = 32
4r = 32

Divide each side by '4'.
r = 8

Simplifying
r = 8

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