y+5.7=4.2

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Solution for y+5.7=4.2 equation: 


Simplifying
y + 5.7 = 4.2

Reorder the terms:
5.7 + y = 4.2

Solving
5.7 + y = 4.2

Solving for variable 'y'.

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

Add '-5.7' to each side of the equation.
5.7 + -5.7 + y = 4.2 + -5.7

Combine like terms: 5.7 + -5.7 = 0.0
0.0 + y = 4.2 + -5.7
y = 4.2 + -5.7

Combine like terms: 4.2 + -5.7 = -1.5
y = -1.5

Simplifying
y = -1.5

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