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x in (-oo:+oo)
(1/4)*(x-8)-((3/4)*x) = 0
(1/4)*(x-8)+(-3/4)*x = 0
1/4*(x-8)+(-3*x)/4 = 0
(1/4*4*(x-8))/4+(-3*x)/4 = 0
1/4*4*(x-8)-3*x = 0
-2*x-8 = 0
(-2*x-8)/4 = 0
(-2*x-8)/4 = 0 // * 4
-2*x-8 = 0
-2*x-8 = 0 // + 8
-2*x = 8 // : -2
x = 8/(-2)
x = -4
x = -4
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