-4a+6x-4c+6y-4b
-4a -4b -4c +6x+6y
factor out 4 from the a b c terms and 6 from the x y terms
-4(a+b+c) + 6(c+y)
a+b+c = -9 so replace a+b+c with -9 and x+y = 8 so replace x+y with 8
-4(-9) +6(8)
36 +48
84
9.4m questions
12.2m answers