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x in (-oo:+oo)
(9/2)*x-((1/2)*x)+5+6 = 4 // - 4
(9/2)*x-((1/2)*x)-4+5+6 = 0
(9/2)*x+(-1/2)*x-4+5+6 = 0
4*x+7 = 0 // - 7
4*x = -7 // : 4
x = -7/4
x = -7/4
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