12.4-b=8.5

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Solution for 12.4-b=8.5 equation: 


Simplifying
12.4 + -1b = 8.5

Solving
12.4 + -1b = 8.5

Solving for variable 'b'.

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

Add '-12.4' to each side of the equation.
12.4 + -12.4 + -1b = 8.5 + -12.4

Combine like terms: 12.4 + -12.4 = 0.0
0.0 + -1b = 8.5 + -12.4
-1b = 8.5 + -12.4

Combine like terms: 8.5 + -12.4 = -3.9
-1b = -3.9

Divide each side by '-1'.
b = 3.9

Simplifying
b = 3.9

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