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x in (-oo:+oo)
(9/2)*x+9 = 6/5 // - 6/5
(9/2)*x-(6/5)+9 = 0
(9/2)*x-6/5+9 = 0
9/2*x+39/5 = 0 // - 39/5
9/2*x = -39/5 // : 9/2
x = -39/5/9/2
x = -26/15
x = -26/15
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