Explain how to isolate the variable in the equation -2/3+7=15

5(-9w) put expression in distributive property

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x