Explanation:
To solve for x, we can begin by simplifying both sides of the equation:
0.06(10000) + 0.08x = 0.072(10000 + x)
600 + 0.08x = 720 + 0.072x
0.08x - 0.072x = 720 - 600
0.008x = 120
x = 120 / 0.008
x = 15,000
Therefore, the value of x is 15,000.