Question

calculo 7.(×-1)=2.(3-×+1)

Answer 1

7.(x - 1) = 2.(3 - x + 1)
7x - 7 = 2.(4 - x)
7x - 7 = 8 - 2x
7x + 2x = 8 + 7
9x = 15
x = 15   (:3)
      ----
        9   (:3)

x =  5
      -----
        3