7x-3x=7+5
4x=12
X=3
This is the answer
I think it’s A pretty sire

We divide first number from first parenthesis with first number from second parenthesis. Then the resulting number we multiply by all numbers in second parenthesis and substract from first parenthesis.

We repeat previous steps until we run out of numbers:


We are left with a number that has no x inside. This is remainder.
The final solution is sum of all these solutions and remainder:
5 minutes would be 290 and 8 minutes would be 464.
I think it’s the second one but i am not 100% sure