Tìm nghiệm đa thức 2x(x-2)

How do you solving the solution of each system using elimination?

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

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers