7 razy x + 9=5 x + 21 na dziś
7x + 9 = 5x +21
2x = 12
x = 6
7x+9=5x+21
7x-5x=21-9
2x=12/2
x=6
:)
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7x + 9 = 5x +21
2x = 12
x = 6
7x+9=5x+21
7x-5x=21-9
2x=12/2
x=6
:)