3y+4+5y-2=42

Solution for 3y+4+5y-2=42 equation:

Simplifying
3y + 4 + 5y + -2 = 42

Reorder the terms:
4 + -2 + 3y + 5y = 42

Combine like terms: 4 + -2 = 2
2 + 3y + 5y = 42

Combine like terms: 3y + 5y = 8y
2 + 8y = 42

Solving
2 + 8y = 42

Solving for variable 'y'.

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

Add '-2' to each side of the equation.
2 + -2 + 8y = 42 + -2

Combine like terms: 2 + -2 = 0
0 + 8y = 42 + -2
8y = 42 + -2

Combine like terms: 42 + -2 = 40
8y = 40

Divide each side by '8'.
y = 5

Simplifying
y = 5