8.1=4.2-0.5y

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Solution for 8.1=4.2-0.5y equation: 


Simplifying
8.1 = 4.2 + -0.5y

Solving
8.1 = 4.2 + -0.5y

Solving for variable 'y'.

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

Add '0.5y' to each side of the equation.
8.1 + 0.5y = 4.2 + -0.5y + 0.5y

Combine like terms: -0.5y + 0.5y = 0.0
8.1 + 0.5y = 4.2 + 0.0
8.1 + 0.5y = 4.2

Add '-8.1' to each side of the equation.
8.1 + -8.1 + 0.5y = 4.2 + -8.1

Combine like terms: 8.1 + -8.1 = 0.0
0.0 + 0.5y = 4.2 + -8.1
0.5y = 4.2 + -8.1

Combine like terms: 4.2 + -8.1 = -3.9
0.5y = -3.9

Divide each side by '0.5'.
y = -7.8

Simplifying
y = -7.8

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