We know that the distance between a point p(x1,y1,z1) and a plane Ax+By+Cz=D is given by,
d=∣∣
∣∣Ax1+By1+Cz1−D√A2+B2+C2∣∣
∣∣....(1)
Thus distance of point (−6,0,0) from plane 2x−3y+6z−2=0 is
d=∣∣
∣
∣∣2(−6)−3×0+6×0−2√(1)2+(2)2+(−2)2∣∣
∣
∣∣=∣∣∣−14√49∣∣∣=147=2