4-r(5)=20

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


Simplifying
4 + -1r(5) = 20

Reorder the terms for easier multiplication:
4 + -1 * 5r = 20

Multiply -1 * 5
4 + -5r = 20

Solving
4 + -5r = 20

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 + -5r = 20 + -4

Combine like terms: 4 + -4 = 0
0 + -5r = 20 + -4
-5r = 20 + -4

Combine like terms: 20 + -4 = 16
-5r = 16

Divide each side by '-5'.
r = -3.2

Simplifying
r = -3.2

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