0.8+1.2+0.5+y=3.9

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Solution for 0.8+1.2+0.5+y=3.9 equation: 


Simplifying
0.8 + 1.2 + 0.5 + y = 3.9

Combine like terms: 0.8 + 1.2 = 2
2 + 0.5 + y = 3.9

Combine like terms: 2 + 0.5 = 2.5
2.5 + y = 3.9

Solving
2.5 + y = 3.9

Solving for variable 'y'.

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

Add '-2.5' to each side of the equation.
2.5 + -2.5 + y = 3.9 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + y = 3.9 + -2.5
y = 3.9 + -2.5

Combine like terms: 3.9 + -2.5 = 1.4
y = 1.4

Simplifying
y = 1.4

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