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x in (-oo:+oo)
x-(9/2)+9/2 = -x/5 // + -x/5
x-(-x/5)-(9/2)+9/2 = 0
x+(1/5)*x-9/2+9/2 = 0
6/5*x = 0 // : 6/5
x = 0
x = 0
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