.3x+.4y=90

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Solution for .3x+.4y=90 equation: 


Simplifying
0.3x + 0.4y = 90

Solving
0.3x + 0.4y = 90

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 = 90 + -0.4y

Combine like terms: 0.4y + -0.4y = 0.0
0.3x + 0.0 = 90 + -0.4y
0.3x = 90 + -0.4y

Divide each side by '0.3'.
x = 300 + -1.333333333y

Simplifying
x = 300 + -1.333333333y

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