2x+3y=6<span>Simplifying
2x + 3y = 6
Solving
2x + 3y = 6
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3y' to each side of the equation.
2x + 3y + -3y = 6 + -3y
Combine like terms: 3y + -3y = 0
2x + 0 = 6 + -3y
2x = 6 + -3y
Divide each side by '2'.
x = 3 + -1.5y
Simplifying
x = 3 + -1.5y HOPE IT HELPS:)</span>
2.7 gallons. Since the tank is already 4/5 full, only 1/5 is needed to fill it completely. As 13.5 gallons represent 5/5 (the full tank), you can take 13.5 divided by 5 to find 1/5.
