9+3=4b

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Solution for 9+3=4b equation:


Simplifying
9 + 3 = 4b

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

Solving
12 = 4b

Solving for variable 'b'.

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

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

Combine like terms: 4b + -4b = 0
12 + -4b = 0

Add '-12' to each side of the equation.
12 + -12 + -4b = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -4b = 0 + -12
-4b = 0 + -12

Combine like terms: 0 + -12 = -12
-4b = -12

Divide each side by '-4'.
b = 3

Simplifying
b = 3

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