-8(1+5b)=21

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Solution for -8(1+5b)=21 equation: 


Simplifying
-8(1 + 5b) = 21
(1 * -8 + 5b * -8) = 21
(-8 + -40b) = 21

Solving
-8 + -40b = 21

Solving for variable 'b'.

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

Add '8' to each side of the equation.
-8 + 8 + -40b = 21 + 8

Combine like terms: -8 + 8 = 0
0 + -40b = 21 + 8
-40b = 21 + 8

Combine like terms: 21 + 8 = 29
-40b = 29

Divide each side by '-40'.
b = -0.725

Simplifying
b = -0.725

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