42=3y+4y

Solution for 42=3y+4y equation:

Simplifying
42 = 3y + 4y

Combine like terms: 3y + 4y = 7y
42 = 7y

Solving
42 = 7y

Solving for variable 'y'.

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

Add '-7y' to each side of the equation.
42 + -7y = 7y + -7y

Combine like terms: 7y + -7y = 0
42 + -7y = 0

Add '-42' to each side of the equation.
42 + -42 + -7y = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -7y = 0 + -42
-7y = 0 + -42

Combine like terms: 0 + -42 = -42
-7y = -42

Divide each side by '-7'.
y = 6

Simplifying
y = 6