exam Maths Puzzle Numerical Ability

i need help with this problem 5a divided by 7 equals -10 the 5a is over the 7. if u could please explain this problem to me i would greatly appreciate it.

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exam Other Question

solve by using the quadratic formula?

5x^2+5x=3
At 5 pm Roger zoomed off from Asteroid. One hour later, Maryanne zoomed off from Asteroid in the opposite direction at a speed 400 kph less than that of Roger. If they were 7900 km apart at 11 p.m how fast did each travel?