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x in (-oo:+oo)
5*x+2 = 9/7 // - 9/7
5*x-(9/7)+2 = 0
5*x-9/7+2 = 0
5*x+5/7 = 0 // - 5/7
5*x = -5/7 // : 5
x = -5/7/5
x = -1/7
x = -1/7
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