.80b-9=3

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Solution for .80b-9=3 equation: 


Simplifying
0.80b + -9 = 3

Reorder the terms:
-9 + 0.80b = 3

Solving
-9 + 0.80b = 3

Solving for variable 'b'.

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

Add '9' to each side of the equation.
-9 + 9 + 0.80b = 3 + 9

Combine like terms: -9 + 9 = 0
0 + 0.80b = 3 + 9
0.80b = 3 + 9

Combine like terms: 3 + 9 = 12
0.80b = 12

Divide each side by '0.80'.
b = 15

Simplifying
b = 15

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