-12=0.25(4+20r)-8r

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Solution for -12=0.25(4+20r)-8r equation:


Simplifying
-12 = 0.25(4 + 20r) + -8r
-12 = (4 * 0.25 + 20r * 0.25) + -8r
-12 = (1 + 5r) + -8r

Combine like terms: 5r + -8r = -3r
-12 = 1 + -3r

Solving
-12 = 1 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
-12 + 3r = 1 + -3r + 3r

Combine like terms: -3r + 3r = 0
-12 + 3r = 1 + 0
-12 + 3r = 1

Add '12' to each side of the equation.
-12 + 12 + 3r = 1 + 12

Combine like terms: -12 + 12 = 0
0 + 3r = 1 + 12
3r = 1 + 12

Combine like terms: 1 + 12 = 13
3r = 13

Divide each side by '3'.
r = 4.333333333

Simplifying
r = 4.333333333

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