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