37.5 is the answer for your question
x = -0.6
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
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