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10/100 * 100 + x = 2(100 + x)
10+x=200+2x
-x=190
x=-190
zamieniam procent na liczbę
0,1*100+ 1*x = 2(100+x)
10+x= 200+2x
x-2x = 200-10
-x= 190 / : (-1)
x=-190
1000% + 100x% = 20000% + 20000% + 200x%
100x% - 200x% = 20000% - 1000%
-100x% = 19000% //: -100%
x = -190