Question

1/3M(x) - 2N(x), если M(x)=3x-9,N(x)=7-x
1)3x+11
2)-3x+17
3)3x-17
4)-x-117

Answer 1

$frac{1}{3}(3x-9)-2(7-x)=(x-3)-(14-2x)=x-3-14+2x= \ =3x-17$