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(4/5)*(10*x-15) = 2*(4*x-6) // - 2*(4*x-6)
(4/5)*(10*x-15)-(2*(4*x-6)) = 0
(4/5)*(10*x-15)-2*(4*x-6) = 0
4/5*(10*x-15)-2*(4*x-6) = 0
4/5*(10*x-15)-2*(4*x-6) = 0
0 = 0
0 = 0
0 = 0
x należy do R
x in (-oo:+oo)
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