1)4/5х+3/20х=-0,12+1,5
16/20х+3/20х=1,38
19/20х=1,38
х=1,38/ 19/20=1,38 * 20/19=1,45.
2)5/14х-4/21х=-7,5+12
15/42х-8/42х=4,5
7/42х=4,5
1/6х=4,5
х=4,5/ 1/6=4,5*6=27.
3)-1/3х+3х=4,25-0,25
8/3х=4
х=4/ 8/3=4* 3/8= 1,5.
4)-0.25х+4х=5 3/7 -3/7
3,75 х=5
х=5 / 3 3/4=5* 4/15= 4/3= 1,33.