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x in (-oo:+oo)
(2*x)/5-(9*y) = 6 // - 6
(2*x)/5-(9*y)-6 = 0
(2*x)/5-9*y-6 = 0
2/5*x-9*y-6 = 0 // + -9*y-6
2/5*x = -(-9*y-6) // : 2/5
x = (-(-9*y-6))/2/5
x = 5/2*(6-(-9*y))
x = 5/2*(6-(-9*y))
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