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x in (-oo:+oo)
2*x-10 = (1/2)*(4*x-20) // - (1/2)*(4*x-20)
2*x-((1/2)*(4*x-20))-10 = 0
(-1/2)*(4*x-20)+2*x-10 = 0
2*x-1/2*(4*x-20)-10 = 0
2*x-1/2*(4*x-20)-10 = 0
10-10 = 0
0 = 0
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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