(13b-9)-4(3b+4)=-4

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Solution for (13b-9)-4(3b+4)=-4 equation:


Simplifying
(13b + -9) + -4(3b + 4) = -4

Reorder the terms:
(-9 + 13b) + -4(3b + 4) = -4

Remove parenthesis around (-9 + 13b)
-9 + 13b + -4(3b + 4) = -4

Reorder the terms:
-9 + 13b + -4(4 + 3b) = -4
-9 + 13b + (4 * -4 + 3b * -4) = -4
-9 + 13b + (-16 + -12b) = -4

Reorder the terms:
-9 + -16 + 13b + -12b = -4

Combine like terms: -9 + -16 = -25
-25 + 13b + -12b = -4

Combine like terms: 13b + -12b = 1b
-25 + 1b = -4

Solving
-25 + 1b = -4

Solving for variable 'b'.

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

Add '25' to each side of the equation.
-25 + 25 + 1b = -4 + 25

Combine like terms: -25 + 25 = 0
0 + 1b = -4 + 25
1b = -4 + 25

Combine like terms: -4 + 25 = 21
1b = 21

Divide each side by '1'.
b = 21

Simplifying
b = 21

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