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5x = 12
x = 2,4
b) x-2/x+3 = 1/2
2(x-2) = x+3
2x-4 = x+3
x = 7
c) 2x/x+1 = 2/3
3*2x = 2(x+1)
6x = 2x +2
8x = 2
x = 1/4
d) x-4/3x = 1/9
9(x-4) =3x
9x-36=3x
6x=36
x=6