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((5*x)/6)*x = ((7*x)/10)*x-4 // - ((7*x)/10)*x-4
((5*x)/6)*x-(((7*x)/10)*x)+4 = 0
((5*x)/6)*x+(-7/10)*x^2+4 = 0
2/15*x^2 = -4 // : 2/15
x^2 = -30
x belongs to the empty set
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