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