9x² = 25
x² = 25÷9 /× pierw.
x = +- pierw. z 25/9
x = 5/3 U x = - 5/3
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9x² = 25
x² = 25÷9 /× pierw.
x = +- pierw. z 25/9
x = 5/3 U x = - 5/3