-128=-4(2+5b)

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Solution for -128=-4(2+5b) equation:


Simplifying
-128 = -4(2 + 5b)
-128 = (2 * -4 + 5b * -4)
-128 = (-8 + -20b)

Solving
-128 = -8 + -20b

Solving for variable 'b'.

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

Add '20b' to each side of the equation.
-128 + 20b = -8 + -20b + 20b

Combine like terms: -20b + 20b = 0
-128 + 20b = -8 + 0
-128 + 20b = -8

Add '128' to each side of the equation.
-128 + 128 + 20b = -8 + 128

Combine like terms: -128 + 128 = 0
0 + 20b = -8 + 128
20b = -8 + 128

Combine like terms: -8 + 128 = 120
20b = 120

Divide each side by '20'.
b = 6

Simplifying
b = 6

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