3b+4b-6=15

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Solution for 3b+4b-6=15 equation: 


Simplifying
3b + 4b + -6 = 15

Reorder the terms:
-6 + 3b + 4b = 15

Combine like terms: 3b + 4b = 7b
-6 + 7b = 15

Solving
-6 + 7b = 15

Solving for variable 'b'.

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

Add '6' to each side of the equation.
-6 + 6 + 7b = 15 + 6

Combine like terms: -6 + 6 = 0
0 + 7b = 15 + 6
7b = 15 + 6

Combine like terms: 15 + 6 = 21
7b = 21

Divide each side by '7'.
b = 3

Simplifying
b = 3

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