Martina combined different amounts of water, vinegar, and rubbing alcohol to make 38 milliliters (ml) of a solution for a science experiment. The amount of water was x ml. The amount of vinegar was 8 ml less than that of water, and the amount of rubbing alcohol was half the amount of vinegar. This is represented in the equation below:
x + (x − 8) + one half (x − 8) = 38
What was the difference in the amounts of water and rubbing alcohol Martina combined?
8 ml
14 ml
18 ml
20 ml

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x + x - 8 + x/2 - 4 = 38
2x + x/2 = 38 + 8 + 4
5x/2 = 50
5x = 100
x = 20
so d?

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