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(3/5)*x-3/7 = 3*x-(243/175) // - 3*x-(243/175)
(3/5)*x-(3*x)-3/7+243/175 = 0
(3/5)*x-3*x-3/7+243/175 = 0
24/25-12/5*x = 0 // - 24/25
-12/5*x = -24/25 // : -12/5
x = -24/25/(-12/5)
x = 2/5
x = 2/5
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