0.3-2b=3

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Solution for 0.3-2b=3 equation: 


Simplifying
0.3 + -2b = 3

Solving
0.3 + -2b = 3

Solving for variable 'b'.

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

Add '-0.3' to each side of the equation.
0.3 + -0.3 + -2b = 3 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + -2b = 3 + -0.3
-2b = 3 + -0.3

Combine like terms: 3 + -0.3 = 2.7
-2b = 2.7

Divide each side by '-2'.
b = -1.35

Simplifying
b = -1.35

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