exam Maths Puzzle Numerical Ability

19. x/6-2/9=-5/12
37. 4/5x-(x+3/2)=1/4(x-1/3)
39. 1/3x+5(1/9x-4)=8

please help me solve these problems i am having problems. thanks!!!

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You rent a booth at the carnival for $200. You are sellin turkey legs for $2.50 each. By the end of the carnival you made $650 in profit. Write an equation that can be used to find An initial population of 730 quail increases at an anual rate of 20 perecent write an exponential function to model the quail population