105=78+y

Solution for 105=78+y equation:

Simplifying
105 = 78 + y

Solving
105 = 78 + 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.
105 + -1y = 78 + y + -1y

Combine like terms: y + -1y = 0
105 + -1y = 78 + 0
105 + -1y = 78

Add '-105' to each side of the equation.
105 + -105 + -1y = 78 + -105

Combine like terms: 105 + -105 = 0
0 + -1y = 78 + -105
-1y = 78 + -105

Combine like terms: 78 + -105 = -27
-1y = -27

Divide each side by '-1'.
y = 27

Simplifying
y = 27