Question

Answer 1

3x+7 -9x= -11

<=> -6x= -11-7

<=> -6x= -18

<=> x= -18: (-6)= 3

Answer 2

chọn D.

Answer 3

D

Answer 4

\(3x+7-9x=-11=>\left(3x-9x\right)+7=-11\\ =>-6x=-11-7\\ =>-6x=-18\\ =>x=\left(-18\right):\left(-6\right)\\ =>x=3\\ =>D\)

Answer 5

D