.9A-.3B=0

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Solution for .9A-.3B=0 equation: 


Simplifying
0.9A + -0.3B = 0

Solving
0.9A + -0.3B = 0

Solving for variable 'A'.

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

Add '0.3B' to each side of the equation.
0.9A + -0.3B + 0.3B = 0 + 0.3B

Combine like terms: -0.3B + 0.3B = 0.0
0.9A + 0.0 = 0 + 0.3B
0.9A = 0 + 0.3B
Remove the zero:
0.9A = 0.3B

Divide each side by '0.9'.
A = 0.3333333333B

Simplifying
A = 0.3333333333B

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