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

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


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

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

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

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

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

Combine like terms: -9 + -9 = -18
-18 + 13b + -12b = -7

Combine like terms: 13b + -12b = 1b
-18 + 1b = -7

Solving
-18 + 1b = -7

Solving for variable 'b'.

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

Add '18' to each side of the equation.
-18 + 18 + 1b = -7 + 18

Combine like terms: -18 + 18 = 0
0 + 1b = -7 + 18
1b = -7 + 18

Combine like terms: -7 + 18 = 11
1b = 11

Divide each side by '1'.
b = 11

Simplifying
b = 11

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