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x in (-oo:+oo)
((2*7)/3)*x = -1 // + 1
((2*7)/3)*x+1 = 0
14/3*x+1 = 0 // - 1
14/3*x = -1 // : 14/3
x = -1/14/3
x = -3/14
x = -3/14
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