X- 3/7 = 4 what is x in simplest form

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

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Solve the system of equations y= 3/2 - 1, -x+ y =-3