4.2+(-0.4y)=9+(-1y)

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Solution for 4.2+(-0.4y)=9+(-1y) equation: 


Simplifying
4.2 + (-0.4y) = 9 + (-1y)

Solving
4.2 + (-0.4y) = 9 + (-1y)

Solving for variable 'y'.

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

Add '(y)' to each side of the equation.
4.2 + (-0.4y) + (y) = 9 + (-1y) + (y)
4.2 + (-0.4y) + y = 9 + (-1y) + (y)

Combine like terms: (-0.4y) + y = 0.6y
4.2 + 0.6y = 9 + (-1y) + (y)
4.2 + 0.6y = 9 + (-1y) + y

Combine like terms: (-1y) + y = 0
4.2 + 0.6y = 9 + 0
4.2 + 0.6y = 9

Add '-4.2' to each side of the equation.
4.2 + -4.2 + 0.6y = 9 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + 0.6y = 9 + -4.2
0.6y = 9 + -4.2

Combine like terms: 9 + -4.2 = 4.8
0.6y = 4.8

Divide each side by '0.6'.
y = 8

Simplifying
y = 8

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