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3/4x=45
x=45*4/3
x=60
¼ x - czwarta czesc tej liczby
x - ¼ x = 45
¾ x = 45 / *4/3
x=60
x - x/4 = 45 /*4
4x - x = 180
3x = 180 /3
x=60
:)