y-3.4=9

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Solution for y-3.4=9 equation: 


Simplifying
y + -3.4 = 9

Reorder the terms:
-3.4 + y = 9

Solving
-3.4 + y = 9

Solving for variable 'y'.

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

Add '3.4' to each side of the equation.
-3.4 + 3.4 + y = 9 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + y = 9 + 3.4
y = 9 + 3.4

Combine like terms: 9 + 3.4 = 12.4
y = 12.4

Simplifying
y = 12.4

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