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36/49 = x-((4/7)*x)+3/7 // - x-((4/7)*x)+3/7
(4/7)*x-x+36/49-(3/7) = 0
(4/7)*x-x+36/49-3/7 = 0
15/49-3/7*x = 0 // - 15/49
-3/7*x = -15/49 // : -3/7
x = -15/49/(-3/7)
x = 5/7
x = 5/7
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