-.3x+.4y=1.2

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Solution for -.3x+.4y=1.2 equation: 


Simplifying
-0.3x + 0.4y = 1.2

Solving
-0.3x + 0.4y = 1.2

Solving for variable 'x'.

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

Add '-0.4y' to each side of the equation.
-0.3x + 0.4y + -0.4y = 1.2 + -0.4y

Combine like terms: 0.4y + -0.4y = 0.0
-0.3x + 0.0 = 1.2 + -0.4y
-0.3x = 1.2 + -0.4y

Divide each side by '-0.3'.
x = -4 + 1.333333333y

Simplifying
x = -4 + 1.333333333y

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