-3(7+4)-2(7-9)=48+7-84

-3(7+4) -2(7-9) = 48+7 -84

First we  sove the left hand side.

It is:

L.H.S- -3(7+4) -2(7-9)

        =-3*11  -2*(-2)

        =-33 +4

        = -29

Then we solve the right hand side.

It is:

R.H.S- 48+7-84

        = 55 - 84

        = -29

So that: L.H.S = R.H.S