If twice a number added to 3 is divided by the number plus 7, the result is three halves. Find the number?

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What is the result of the following division?

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase