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x in (-oo:+oo)
x = (-9*x)/7-1 // - (-9*x)/7-1
x-((-9*x)/7)+1 = 0
x+(9/7)*x+1 = 0
16/7*x+1 = 0 // - 1
16/7*x = -1 // : 16/7
x = -1/16/7
x = -7/16
x = -7/16
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