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Find the value of the expression given the value of the variables.

1. 3x + 5 ; x = 2
2. 5xy + x - 4, x= -3 and y = 5
3. 6ab-c/abc ; a =5 ;b =3 ; c = 10
4.3(xy + 6); x = -6 and y - 1
5 2x + 5 x / 3 x - y and y = - 8​