Photomach скачай через плай маркет и решай
1)
x+12,4=2,4*8,3
x+12,4=19,92
x=19,92-12,4
x=7,52
==========
2)
x-23,74=1737+2
x-23,74=1739
x=1739+23,74
x=1762,74
1) ........=3х+9-12+3х-х-3=5х - 6
2) ........=3х+15-4+х-х-3х-3=8
3) ........=2х+8-6+3х-х-4=4х - 2
4) ........=х+1-10+5х-5х-х-5= - 14
5) ........=х+3-2+х-х-4=х-3
6) ........=4х+12-5+х-х-4=4х+3
7) ........=3х+9-4+4х-4х-3х-1=4
8) ........=5х+25-9+3х-х-3=7х+13
9) ........=2х+4-10+5х-5х-2х-1= - 7
10) .......=2х+8-20+4х-4х-2х-3= - 15