=30^n*25/30^n

=25

1- 1/6*(-7)

= 1+7/6

= 13/6

3+3^2m+3^3m=3^2 1

5m=2 1- 1 m=4

Xy 2n * x 2 substitution

1^2n*x^2=x^2=25

It's really easy to get around ~ ~ ~