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186/245 = (4/7)*x-((2/3)*x)+4/5 // - (4/7)*x-((2/3)*x)+4/5
(2/3)*x-((4/7)*x)+186/245-(4/5) = 0
(-4/7)*x+(2/3)*x+186/245-4/5 = 0
2/21*x-2/49 = 0 // + 2/49
2/21*x = 2/49 // : 2/21
x = 2/49/2/21
x = 3/7
x = 3/7
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