0.7х+5(5х-1)=6.5+2.7х

0.7х+25х-5=6.5+2.7х

0.7х+25х-2.7х=6.5+5

23х=7

х=3.2

0.3(0.4х-1.2)+0.36х=3

0.12х-0.36+0.36х=3

0.48х=3+0.36

0.48х=3.36

х=7

0.6(х-0.6)+0.8(х-0.4)=1

0.6х-0.36+0.8х-0.32=1

0.14х=1+0.32+0.36

0.14х=1.68

х=12

1)0.7х+25х-5=6.5+2.7х

0.7x+25x-2.7x=6.5+5

23x=11.5

x=0.5

2)0.12x-0.36+0.36x=3

0.48x=3.36

x=7

3)0.6x-0.36+0.8x-0.32=1

1.4x=1.68

x=1.2