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x in (-oo:+oo)
7*x = 15/1-(2/3) // - 15/1-(2/3)
7*x-(15/1)+2/3 = 0
7*x+2/3-15 = 0
7*x-43/3 = 0 // + 43/3
7*x = 43/3 // : 7
x = 43/3/7
x = 43/21
x = 43/21
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