19-120%x=7 19-1.2x=7 1.2x=19-7 1.2x=12 x=12÷1.2 x=10
10
120/100X=19-7 X=12/120/100 X=10
19-7=1.2x12=1.2xx=10
19-120%x=10
19-120%x=7解:120%x=12 x=120%/12 x=10