-4(8r-5)=21

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Solution for -4(8r-5)=21 equation: 


Simplifying
-4(8r + -5) = 21

Reorder the terms:
-4(-5 + 8r) = 21
(-5 * -4 + 8r * -4) = 21
(20 + -32r) = 21

Solving
20 + -32r = 21

Solving for variable 'r'.

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

Add '-20' to each side of the equation.
20 + -20 + -32r = 21 + -20

Combine like terms: 20 + -20 = 0
0 + -32r = 21 + -20
-32r = 21 + -20

Combine like terms: 21 + -20 = 1
-32r = 1

Divide each side by '-32'.
r = -0.03125

Simplifying
r = -0.03125

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