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x in (-oo:+oo)
-x-13/4 = (1/2)*x-1 // - (1/2)*x-1
1-x-((1/2)*x)-13/4 = 0
(-1/2)*x-x-13/4+1 = 0
-3/2*x-9/4 = 0 // + 9/4
-3/2*x = 9/4 // : -3/2
x = 9/4/(-3/2)
x = -3/2
x = -3/2
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