25. The cost c (in €) for the production of two goods as a function of the produced quantity q₁ of good 1 and 92 of good 2 is a linear function of the variables q₁ and 92. The cost of producing 30 units of good 1 and 40 units of good 2 is €9938. If the production of good 1 is increased by 8 units and at the same time the production of good 2 is decreased by 6 units, then the cost increases by €38. If the production of good 1 is increased by 1 unit while the production of good 2 is kept unchanged, the cost increases by €7. Find the equation of the cost function c (91, 92).

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