12+3b=45

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Solution for 12+3b=45 equation: 


Simplifying
12 + 3b = 45

Solving
12 + 3b = 45

Solving for variable 'b'.

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

Add '-12' to each side of the equation.
12 + -12 + 3b = 45 + -12

Combine like terms: 12 + -12 = 0
0 + 3b = 45 + -12
3b = 45 + -12

Combine like terms: 45 + -12 = 33
3b = 33

Divide each side by '3'.
b = 11

Simplifying
b = 11

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