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(2) 18x+25y=71...18x=71-25y...x=71-25y/18 °reemplazamos y en (2)
18x+25y=71
18x+25(5)=71
18x=-125+71
x=-54/18
x=-3
9-15y/22 = 71-25y/18
18(9-15y) = 22(71-25y)
81-135y = 781-275y
140y = 700
y = 5