y+4.2=3.4

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Solution for y+4.2=3.4 equation: 


Simplifying
y + 4.2 = 3.4

Reorder the terms:
4.2 + y = 3.4

Solving
4.2 + y = 3.4

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 = 3.4 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + y = 3.4 + -4.2
y = 3.4 + -4.2

Combine like terms: 3.4 + -4.2 = -0.8
y = -0.8

Simplifying
y = -0.8

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