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