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x in (-oo:+oo)
(-9/4)*x-(8*x)-(7*x) = x // - x
(-9/4)*x-(8*x)-(7*x)-x = 0
(-9/4)*x-8*x-7*x-x = 0
-73/4*x = 0 // : -73/4
x = 0
x = 0
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