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(1/3)*x = (4/7)*x-(5/14) // - (4/7)*x-(5/14)
(1/3)*x-((4/7)*x)+5/14 = 0
(1/3)*x+(-4/7)*x+5/14 = 0
5/14-5/21*x = 0 // - 5/14
-5/21*x = -5/14 // : -5/21
x = -5/14/(-5/21)
x = 3/2
x = 3/2
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