2*х+6*х+4*х-1472=10528
12*х-1472=10528
12*х=10528+1472
12*х=12000
х=12000:12
х=1000
проверка 2*1000+6*1000+4*1000-1472=2000+6000+4000-1472=12000-1472=
=10 528 верно
...............................................
3*а+2*а+7*а+8654=32654
12*а+8654=32654
12*а=32654-8654
12*а=24000
а=24000:12
а=2000
проверка 3*2000+2*2000+7*2000+8654=6000+4000+14000+8654=
=24000+8654=32 654 верно
..................................
19*с+8*с+12*с+80039=95639
39*с+80039=95639
39*с=95639-80039
39*с=15600
с=15600:39
с=400
проверка 19*400+8*400+12*400+80039=7600+3200+4800+80039=
=95639 верно
.......................................
11*b+14*b+9*b-14671=87329
34*b-14671=87329
34*b=87329+14671
34*b=102000
b=102000:34
b=3000
проверка 11*3000+14*3000+9*3000-14671=33000+42000+27000-14671=
=102000-14671=87329 верно