What is x in x - 4 (x - 3) + 7 = 6 - (x - 4)

The table above shows approximate conversions from gallons to liters. what is the value of x?

For how answer my question this will be the last question can you answer in math subject

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?