4b-12=9-3b

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Solution for 4b-12=9-3b equation:


Simplifying
4b + -12 = 9 + -3b

Reorder the terms:
-12 + 4b = 9 + -3b

Solving
-12 + 4b = 9 + -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
-12 + 4b + 3b = 9 + -3b + 3b

Combine like terms: 4b + 3b = 7b
-12 + 7b = 9 + -3b + 3b

Combine like terms: -3b + 3b = 0
-12 + 7b = 9 + 0
-12 + 7b = 9

Add '12' to each side of the equation.
-12 + 12 + 7b = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 7b = 9 + 12
7b = 9 + 12

Combine like terms: 9 + 12 = 21
7b = 21

Divide each side by '7'.
b = 3

Simplifying
b = 3

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