0.65(2х+1)=2.5*1.3 13(4х-1.9)=0.4*3.25 2,7(3х+1)=9*1,2
0.65х+0.65=3,25 52х-24.7=1.3 8.1х+2.7=10.8
0.65х=3.25-0.65 52х=1.3+24.7 8.1х=10.8-2.7
х=2,6:0.65 х=26:52 х=8.1:8.1
х=4 х=0,5 х=1
1.8(6х+1)=7.2*2.5 1.8(3х+06)=6*2.88 0.375(х-2.8)=0.6*0.75
10.8х+1.8=18 5.4х+1,08=17.28 0.375х-1.05=0.45
10.8х=18-1.8 5.4х=17.28-1.08 0.375х=0,45+1.05
х=16.2:10.8 х=16.2:5.4 х=1,5:0.375
х=1,5 х=3 х=4