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x in (-oo:+oo)
(2/3)*x+1/2 = (3/5)*x-(5/6) // - (3/5)*x-(5/6)
(2/3)*x-((3/5)*x)+1/2+5/6 = 0
(2/3)*x+(-3/5)*x+1/2+5/6 = 0
1/15*x+4/3 = 0 // - 4/3
1/15*x = -4/3 // : 1/15
x = -4/3/1/15
x = -20
x = -20
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