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7*x+(2*y)/74+1 = 18 // - 18
7*x+(2*y)/74-18+1 = 0
7*x+1/37*y-17 = 0 // - 1/37*y-17
7*x = -(1/37*y-17) // : 7
x = (-(1/37*y-17))/7
x = (17-(1/37*y))/7
x = (17-(1/37*y))/7
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