y-4.2=8

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Solution for y-4.2=8 equation: 


Simplifying
y + -4.2 = 8

Reorder the terms:
-4.2 + y = 8

Solving
-4.2 + y = 8

Solving for variable 'y'.

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

Add '4.2' to each side of the equation.
-4.2 + 4.2 + y = 8 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + y = 8 + 4.2
y = 8 + 4.2

Combine like terms: 8 + 4.2 = 12.2
y = 12.2

Simplifying
y = 12.2

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