Verified answer

3ax - 3bx - ay + by =

(3ax - 3bx) - (ay - by) =

3x(a - b) - y(a - b) =

(3x - y)(a - b).

since your grouping its:

x=3 then y=4

and a is 6 bc y=4 z=5 then a=6 and b=7

so its like the question is:

6+7+3+4=20 which is the answer

3ax - 3bx - ay + by

= (3ax-ay) -(3bx - by)

= a(3x-y) - b(3x-y)

= (a-b)(3x-y)

= (3ax - ay) - (3bx - by)

= a(3x - y) - b(3x - y)

= (a-b)(3x-y)

(3ax - ay) + (bx - 3by)

a(3x - y) - b(3y - x)

=

3x(a-b)-y(a-b)

=

(3x-y) * (a-b)