4/x-3 = 2/x+1 kalo ini gimna yaa?.. :v

4....... 2
---- = ----
x-3... x+1

4(x+1) = 2(x-3)
4x + 4 = 2x - 6
4x - 2x = 4 + 6
2x = 10
x = 5

Semoga membantu.