0.4x-0.2y=-1.8

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Solution for 0.4x-0.2y=-1.8 equation: 


Simplifying
0.4x + -0.2y = -1.8

Solving
0.4x + -0.2y = -1.8

Solving for variable 'x'.

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

Add '0.2y' to each side of the equation.
0.4x + -0.2y + 0.2y = -1.8 + 0.2y

Combine like terms: -0.2y + 0.2y = 0.0
0.4x + 0.0 = -1.8 + 0.2y
0.4x = -1.8 + 0.2y

Divide each side by '0.4'.
x = -4.5 + 0.5y

Simplifying
x = -4.5 + 0.5y

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