12(4r-.83r)+20=19r-15+.45r

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Solution for 12(4r-.83r)+20=19r-15+.45r equation:


Simplifying
12(4r + -0.83r) + 20 = 19r + -15 + 0.45r

Combine like terms: 4r + -0.83r = 3.17r
12(3.17r) + 20 = 19r + -15 + 0.45r

Remove parenthesis around (3.17r)
12 * 3.17r + 20 = 19r + -15 + 0.45r

Multiply 12 * 3.17
38.04r + 20 = 19r + -15 + 0.45r

Reorder the terms:
20 + 38.04r = 19r + -15 + 0.45r

Reorder the terms:
20 + 38.04r = -15 + 19r + 0.45r

Combine like terms: 19r + 0.45r = 19.45r
20 + 38.04r = -15 + 19.45r

Solving
20 + 38.04r = -15 + 19.45r

Solving for variable 'r'.

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

Add '-19.45r' to each side of the equation.
20 + 38.04r + -19.45r = -15 + 19.45r + -19.45r

Combine like terms: 38.04r + -19.45r = 18.59r
20 + 18.59r = -15 + 19.45r + -19.45r

Combine like terms: 19.45r + -19.45r = 0.00
20 + 18.59r = -15 + 0.00
20 + 18.59r = -15

Add '-20' to each side of the equation.
20 + -20 + 18.59r = -15 + -20

Combine like terms: 20 + -20 = 0
0 + 18.59r = -15 + -20
18.59r = -15 + -20

Combine like terms: -15 + -20 = -35
18.59r = -35

Divide each side by '18.59'.
r = -1.882732652

Simplifying
r = -1.882732652

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