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x in (-oo:+oo)
-((1/2)*(4*x-10)) = 15 // - 15
-((1/2)*(4*x-10))-15 = 0
(-1/2)*(4*x-10)-15 = 0
-1/2*(4*x-10)-15 = 0
-1/2*(4*x-10)-15 = 0
-2*x-10 = 0
-2*x-10 = 0
-2*x-10 = 0 // + 10
-2*x = 10 // : -2
x = 10/(-2)
x = -5
x = -5
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