-129=4(1-4b)-5

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Solution for -129=4(1-4b)-5 equation:


Simplifying
-129 = 4(1 + -4b) + -5
-129 = (1 * 4 + -4b * 4) + -5
-129 = (4 + -16b) + -5

Reorder the terms:
-129 = 4 + -5 + -16b

Combine like terms: 4 + -5 = -1
-129 = -1 + -16b

Solving
-129 = -1 + -16b

Solving for variable 'b'.

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

Add '16b' to each side of the equation.
-129 + 16b = -1 + -16b + 16b

Combine like terms: -16b + 16b = 0
-129 + 16b = -1 + 0
-129 + 16b = -1

Add '129' to each side of the equation.
-129 + 129 + 16b = -1 + 129

Combine like terms: -129 + 129 = 0
0 + 16b = -1 + 129
16b = -1 + 129

Combine like terms: -1 + 129 = 128
16b = 128

Divide each side by '16'.
b = 8

Simplifying
b = 8

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