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x in (-oo:+oo)
8*x+3 = (5*x)/15 // - (5*x)/15
8*x-((5*x)/15)+3 = 0
8*x+(-1/3)*x+3 = 0
23/3*x+3 = 0 // - 3
23/3*x = -3 // : 23/3
x = -3/23/3
x = -9/23
x = -9/23
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