b-0.4=3.1

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Solution for b-0.4=3.1 equation: 


Simplifying
b + -0.4 = 3.1

Reorder the terms:
-0.4 + b = 3.1

Solving
-0.4 + b = 3.1

Solving for variable 'b'.

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

Add '0.4' to each side of the equation.
-0.4 + 0.4 + b = 3.1 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + b = 3.1 + 0.4
b = 3.1 + 0.4

Combine like terms: 3.1 + 0.4 = 3.5
b = 3.5

Simplifying
b = 3.5

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