-84=5(4-r)-8r

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Solution for -84=5(4-r)-8r equation:


Simplifying
-84 = 5(4 + -1r) + -8r
-84 = (4 * 5 + -1r * 5) + -8r
-84 = (20 + -5r) + -8r

Combine like terms: -5r + -8r = -13r
-84 = 20 + -13r

Solving
-84 = 20 + -13r

Solving for variable 'r'.

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

Add '13r' to each side of the equation.
-84 + 13r = 20 + -13r + 13r

Combine like terms: -13r + 13r = 0
-84 + 13r = 20 + 0
-84 + 13r = 20

Add '84' to each side of the equation.
-84 + 84 + 13r = 20 + 84

Combine like terms: -84 + 84 = 0
0 + 13r = 20 + 84
13r = 20 + 84

Combine like terms: 20 + 84 = 104
13r = 104

Divide each side by '13'.
r = 8

Simplifying
r = 8

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