Question

add 15 to the product of 3 and b

Answer 1

product= 3*b=3b
⇒15+3b=0
⇒3b=-15
⇒b= -15/3
⇒b= -5

so addition= 15+3*-5
                 =15+(-15)
                 =0
L.H.S=R.H.S

Answer 2

product of 3 and b
=3xb=3b
so, 15+3b=0
=3b=-15
=> b=-15/3
=> b=-5
now, add 15
so,
=15+3x-5
=15+(-15)
=0
0=0
so LHS=RHS
HOPED IT HELP YOU