How much of an 8% solution should we use to make 100g of 3% solution?Please use the picture for the format :) thank you!!

x = -0.6
Explanation:The equation that represents this scenario is:
0.7x + 0.1*3 = 0.4(x + 3)
Solving for x, we have:
0.7x + 0.3 = 0.4x + 0.12
0.7x - 0.4x = 0.12 - 0.3
0.3x = -0.18
x = -0.18/0.3
= -0.6