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x in (-oo:+oo)
-1 = (1/2)*x-((3/4)*x)-7 // - (1/2)*x-((3/4)*x)-7
(3/4)*x-((1/2)*x)-1+7 = 0
(-1/2)*x+(3/4)*x-1+7 = 0
1/4*x+6 = 0 // - 6
1/4*x = -6 // : 1/4
x = -6/1/4
x = -24
x = -24
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