exam Maths Puzzle Numerical Ability

Help me please!! I dont understand how to do this with a fraction:

4a+3/4=19/4

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exam Other Question

The problem is:

A real estate agent recieves a monthly salary of $1500 plus a 4% commision on every home sold. For what amount of monthly sales will the agent earn at least $5000? log8(x+6)-log8x=2