81=-5(1-3b)-4

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Solution for 81=-5(1-3b)-4 equation:


Simplifying
81 = -5(1 + -3b) + -4
81 = (1 * -5 + -3b * -5) + -4
81 = (-5 + 15b) + -4

Reorder the terms:
81 = -5 + -4 + 15b

Combine like terms: -5 + -4 = -9
81 = -9 + 15b

Solving
81 = -9 + 15b

Solving for variable 'b'.

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

Add '-15b' to each side of the equation.
81 + -15b = -9 + 15b + -15b

Combine like terms: 15b + -15b = 0
81 + -15b = -9 + 0
81 + -15b = -9

Add '-81' to each side of the equation.
81 + -81 + -15b = -9 + -81

Combine like terms: 81 + -81 = 0
0 + -15b = -9 + -81
-15b = -9 + -81

Combine like terms: -9 + -81 = -90
-15b = -90

Divide each side by '-15'.
b = 6

Simplifying
b = 6

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