Given the augmented matrix below, solve the associated system of equations. For your non-Basic (free) variables use the notation from this list x1 , x2, x3, x4, x5, and x6 as needed. [1 2 -7 6 9 3 0 0 0 1 1 1 3 0 0 0 0 1 -8 | -2 -9 -9]

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.