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3*x+2/5 = (6/7)*x-(47/70) // - (6/7)*x-(47/70)
3*x-((6/7)*x)+2/5+47/70 = 0
3*x+(-6/7)*x+2/5+47/70 = 0
15/7*x+15/14 = 0 // - 15/14
15/7*x = -15/14 // : 15/7
x = -15/14/15/7
x = -1/2
x = -1/2
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