3b(a-b)=3ab-3b^2
-5(0.8c-0.9d)= -4c+ 4.5d
-1/9(3x-4y)= -1/3x+ 4/9 y
ax-3bx-cx=x(a-b-c)
-bm-bn-bk=-b(m+n+k)
-1.6(2A-7)=-3.2A+11.2 -3.2*6+11.2=-8
-0.4(3B+4)=-1.2B-1.6 -1.2*7-1.6=-10
-2/3(3/4-1.5C)=-1/2+C -0.5-3.5=-4
3b(a-b)=3ab-3b^2
-5(0.8c-0.9d)= -4c+ 4.5d
-1/9(3x-4y)= -1/3x+ 4/9 y
ax-3bx-cx=x(a-b-c)
-bm-bn-bk=-b(m+n+k)
-1.6(2A-7)=-3.2A+11.2 -3.2*6+11.2=-8
-0.4(3B+4)=-1.2B-1.6 -1.2*7-1.6=-10
-2/3(3/4-1.5C)=-1/2+C -0.5-3.5=-4