Paragraph 24 discusses non monetary exchanges and requires that “if an asset is acquired in exchange for another asset (whether similar or dissimilar in nature), the cost will be measured at the fair value unless (a) the exchange transaction lacks commercial substance or (b) the fair value of neither the asset received nor the asset given up is reliably measurable. If the acquired item is not measured at fair value, its cost is measured at the carrying amount of the asset given up”.
Generally this will mean FV must be used unless you meet the other criteria. Since you state the extraction equipment has a FV of 75, that is what you would use as the sale amount. Difference between that and the BV of motor vehicles given up is your gain or loss.