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60%x + 21 = 2x
60%x + 21 = 200%x | -60%x
21 = 140%x
21 = 1,4x |:1,4
15 = x
x = 15
;))
0,6x-2x=-21
-1,4x=-21/:(-1,4)
x=15
60%x=2x-21
0,6x=2x-21
0,6x-2x=-21
-1,4x=-21/:(-1,4)
x=15
odp.szukana liczba to 15