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7y = 1
Y= 1/7
5x + 3y = 9
5x + 3 x 1/7 = 9
5x + 3/7 = 9
5x = 9-5/7
5x = 68/7
X = 68/7 : 5
X = 68/7 x 1/5
X = 68/35
y = 1/7
5x + 3.1/7 = 9
5x + 3/7 = 9
5x = 9 - 3/7
x = 60/7 x 1/5
x = 60/35
x = 1 5/7