Okay here's the equation:
0.75x = 36.00
x is the amount of newspapers you sell. We put it as x because we dont know how much we need to sell to buy soccer cleats, which are $36.00. To solve, we will use inverse operations:
0.75x = 36.00
0.75x / 0.75 = 36.00 / 0.75
x = 48
You will have to sell 48 newspapers to get the soccer cleats.