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30%x=20%*(x+12)
30/100 *x= 20/100*(x+12)
0,3x= 0,2*(x+12)
0,3x= o,2x+ 0,2 *12
0,3x=0,2x +2,4
0,3x - o,2x =2,4
0,1x=2,4 | *10
x=24