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x in (-oo:+oo)
x+(5/2)*x+9 = 4/7 // - 4/7
x+(5/2)*x-(4/7)+9 = 0
x+(5/2)*x-4/7+9 = 0
7/2*x+59/7 = 0 // - 59/7
7/2*x = -59/7 // : 7/2
x = -59/7/7/2
x = -118/49
x = -118/49
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