Дам 25 балов
Розв'язати систему рівнянь способом додавання: а) 4х - 5у = 2, 6х - 7у = -11; б) (m+1)/5 - (3n - 5)/10 = -2, (m-3)/6 + (5n - 9)/4 = 2.5
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