-5=0.255(4+20r)-8r

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Solution for -5=0.255(4+20r)-8r equation:


Simplifying
-5 = 0.255(4 + 20r) + -8r
-5 = (4 * 0.255 + 20r * 0.255) + -8r
-5 = (1.02 + 5.1r) + -8r

Combine like terms: 5.1r + -8r = -2.9r
-5 = 1.02 + -2.9r

Solving
-5 = 1.02 + -2.9r

Solving for variable 'r'.

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

Add '2.9r' to each side of the equation.
-5 + 2.9r = 1.02 + -2.9r + 2.9r

Combine like terms: -2.9r + 2.9r = 0.0
-5 + 2.9r = 1.02 + 0.0
-5 + 2.9r = 1.02

Add '5' to each side of the equation.
-5 + 5 + 2.9r = 1.02 + 5

Combine like terms: -5 + 5 = 0
0 + 2.9r = 1.02 + 5
2.9r = 1.02 + 5

Combine like terms: 1.02 + 5 = 6.02
2.9r = 6.02

Divide each side by '2.9'.
r = 2.075862069

Simplifying
r = 2.075862069

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