plis na teraz , ;d
rozwiąż równanie :
7x - ( x+3) = 21 - (x - 3 )
7x-x-3=21-x+3
6x+x=24+3
7x=27
x=3,86
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7x-x-3=21-x+3
6x+x=24+3
7x=27
x=3,86