-4(1+5b)=31

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Solution for -4(1+5b)=31 equation: 


Simplifying
-4(1 + 5b) = 31
(1 * -4 + 5b * -4) = 31
(-4 + -20b) = 31

Solving
-4 + -20b = 31

Solving for variable 'b'.

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

Add '4' to each side of the equation.
-4 + 4 + -20b = 31 + 4

Combine like terms: -4 + 4 = 0
0 + -20b = 31 + 4
-20b = 31 + 4

Combine like terms: 31 + 4 = 35
-20b = 35

Divide each side by '-20'.
b = -1.75

Simplifying
b = -1.75

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