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x in (-oo:+oo)
5*x+2/3 = (5*x)/3 // - (5*x)/3
5*x-((5*x)/3)+2/3 = 0
5*x+(-5/3)*x+2/3 = 0
10/3*x+2/3 = 0 // - 2/3
10/3*x = -2/3 // : 10/3
x = -2/3/10/3
x = -1/5
x = -1/5
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