Question

what is -4+7(1+3n) simplify

Answer 1

here is your answer
-4+7+21n
3+21n
or, =3(1+7n)
hope it helps you
solved according to bodmas

Answer 2

-4+7(1+3n)=0
3(1+3n)=0
multiply the bracket by 3
so
3+9n=0
9n=0-3
9n=-3
n=-3/9
n=-1/3
its your answer
i hope it helps you