− 76 = 5(1 + 3b) +3(3b − 3)

Question

− 76 = 5(1 + 3b) +3(3b − 3)

Answer 1

-76=5+15b+9b-9
-76-5+9=15b+9b
-72=24b
b=-3

Comments

спс

Answer 2

− 76 = 5(1 + 3b) +3(3b − 3)
5(1 + 3b) +3(3b − 3)=-76
5+5•3b+3•3b-3•3=-76
5+15b+9b-9=-76
-4+24b=-76
24b=-76+4
24b=-(76-4)
24•b=-72
24|:24=-72|:24
b=-3