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a√2 - a√3 = - 3
a(√2 - √3) = - 3
a = - 3/(√2 - √3) można usunąć niewymierność
a = - 3(√2 + √3)/(√2 - √3)(√2 + √3) = - 3(√2 + √3)/2 - 3 = - 3(√2 + √3)/- 1 =
= 3(√2 + √3)