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x in (-oo:+oo)
x+10*x = 71/3 // - 71/3
x+10*x-(71/3) = 0
x+10*x-71/3 = 0
11*x-71/3 = 0 // + 71/3
11*x = 71/3 // : 11
x = 71/3/11
x = 71/33
x = 71/33
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