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x in (-oo:+oo)
6 = (7/2)*x+(9/2)*x-2 // - (7/2)*x+(9/2)*x-2
2-((7/2)*x)-((9/2)*x)+6 = 0
(-7/2)*x+(-9/2)*x+2+6 = 0
8-8*x = 0 // - 8
-8*x = -8 // : -8
x = -8/(-8)
x = 1
x = 1
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