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

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


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

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

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

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

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

Combine like terms: -7 + -12 = -19
-19 + 13b + -12b = -7

Combine like terms: 13b + -12b = 1b
-19 + 1b = -7

Solving
-19 + 1b = -7

Solving for variable 'b'.

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

Add '19' to each side of the equation.
-19 + 19 + 1b = -7 + 19

Combine like terms: -19 + 19 = 0
0 + 1b = -7 + 19
1b = -7 + 19

Combine like terms: -7 + 19 = 12
1b = 12

Divide each side by '1'.
b = 12

Simplifying
b = 12

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