7.4+(-3.9)=y

Solution for 7.4+(-3.9)=y equation:

Simplifying
7.4 + (-3.9) = y
7.4 + -3.9 = y

Combine like terms: 7.4 + -3.9 = 3.5
3.5 = y

Solving
3.5 = y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
3.5 + -1y = y + -1y

Combine like terms: y + -1y = 0
3.5 + -1y = 0

Add '-3.5' to each side of the equation.
3.5 + -3.5 + -1y = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + -1y = 0 + -3.5
-1y = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
-1y = -3.5

Divide each side by '-1'.
y = 3.5

Simplifying
y = 3.5