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x in (-oo:+oo)
-6 = (7/4)*x+(11/4)*x+3/2 // - (7/4)*x+(11/4)*x+3/2
-((7/4)*x)-((11/4)*x)-(3/2)-6 = 0
(-7/4)*x+(-11/4)*x-3/2-6 = 0
-9/2*x-15/2 = 0 // + 15/2
-9/2*x = 15/2 // : -9/2
x = 15/2/(-9/2)
x = -5/3
x = -5/3
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