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x in (-oo:+oo)
(1/4)*(8-(10*x))+1/2 = 5 // - 5
(1/4)*(8-(10*x))+1/2-5 = 0
(1/4)*(8-10*x)+1/2-5 = 0
1/4*(8-10*x)+1/2-5 = 0
(1/4*2*(8-10*x))/2+1/2+(-5*2)/2 = 0
1/4*2*(8-10*x)-5*2+1 = 0
5-5*x-10 = 0
-5*x-5 = 0
(-5*x-5)/2 = 0
(-5*x-5)/2 = 0 // * 2
-5*x-5 = 0
-5*x-5 = 0 // + 5
-5*x = 5 // : -5
x = 5/(-5)
x = -1
x = -1
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