(13b-9)-4(3b+4)=-7

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Solution for (13b-9)-4(3b+4)=-7 equation:


Simplifying
(13b + -9) + -4(3b + 4) = -7

Reorder the terms:
(-9 + 13b) + -4(3b + 4) = -7

Remove parenthesis around (-9 + 13b)
-9 + 13b + -4(3b + 4) = -7

Reorder the terms:
-9 + 13b + -4(4 + 3b) = -7
-9 + 13b + (4 * -4 + 3b * -4) = -7
-9 + 13b + (-16 + -12b) = -7

Reorder the terms:
-9 + -16 + 13b + -12b = -7

Combine like terms: -9 + -16 = -25
-25 + 13b + -12b = -7

Combine like terms: 13b + -12b = 1b
-25 + 1b = -7

Solving
-25 + 1b = -7

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 = -7 + 25

Combine like terms: -25 + 25 = 0
0 + 1b = -7 + 25
1b = -7 + 25

Combine like terms: -7 + 25 = 18
1b = 18

Divide each side by '1'.
b = 18

Simplifying
b = 18

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