How many different values for  does the solution set for the equation have?

Which of the following is the solution set for the equation

How many real solutions does this equation have? Two real solutions One repeated solution No real solutions

Consider the following equation: a1 + a2 + a3 + a4 + a5 + a6 = 70. A solution to this equation over the nonnegative integers is a choice of a nonnegative integer for each of the variables a1, a2, a3, a4, a5, a6 that satisfies the equation. For example, a1 = 15, a2 = 3, a3 = 15, a4 = 0, a5 = 7, a6 = 30 is a solution. To be different, two solutions have to differ on the value assigned to some ai. How many different solutions are there to the equation?

In the given system determine the number of solution:*NoneInfiniteOneTwo

How many solutions does this equation have?–6–4r+12=–4r+6