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x in (-oo:+oo)
-(-x-4) = (3/4)*(x-6) // - (3/4)*(x-6)
x-((3/4)*(x-6))+4 = 0
(-3/4)*(x-6)+x+4 = 0
x-3/4*(x-6)+4 = 0
x-3/4*(x-6)+4 = 0
1/4*x+4+9/2 = 0
1/4*x+17/2 = 0
1/4*x+17/2 = 0
1/4*x+17/2 = 0 // - 17/2
1/4*x = -17/2 // : 1/4
x = -17/2/1/4
x = -34
x = -34
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