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2x=28+0,25x
1,75x=28
x=16
2x=25 % + 28 / :25 %
0,5 x = 28 / :0,5
x= 16
x - pewna liczba
2x = 28 + 25%x
2x = 28 + 25/100x
2x = 28 + 1/4x /-¼ obustronnie odejmujemy ¼
1¾x = 28 /:1¾
x = 16