b-9+6b-9=30

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Solution for b-9+6b-9=30 equation:


Simplifying
b + -9 + 6b + -9 = 30

Reorder the terms:
-9 + -9 + b + 6b = 30

Combine like terms: -9 + -9 = -18
-18 + b + 6b = 30

Combine like terms: b + 6b = 7b
-18 + 7b = 30

Solving
-18 + 7b = 30

Solving for variable 'b'.

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

Add '18' to each side of the equation.
-18 + 18 + 7b = 30 + 18

Combine like terms: -18 + 18 = 0
0 + 7b = 30 + 18
7b = 30 + 18

Combine like terms: 30 + 18 = 48
7b = 48

Divide each side by '7'.
b = 6.857142857

Simplifying
b = 6.857142857

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