.40=20*b

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Solution for .40=20*b equation:


Simplifying
0.40 = 20b

Solving
0.40 = 20b

Solving for variable 'b'.

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

Add '-20b' to each side of the equation.
0.40 + -20b = 20b + -20b

Combine like terms: 20b + -20b = 0
0.40 + -20b = 0

Add '-0.40' to each side of the equation.
0.40 + -0.40 + -20b = 0 + -0.40

Combine like terms: 0.40 + -0.40 = 0.00
0.00 + -20b = 0 + -0.40
-20b = 0 + -0.40

Combine like terms: 0 + -0.40 = -0.4
-20b = -0.4

Divide each side by '-20'.
b = 0.02

Simplifying
b = 0.02

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