<span>8(x+6)-28=8x+48-28=8x+20
</span><span>7(2x+3)-10=14x+21-10=14x+11
</span><span>4(9x+7)-26x=36x+28-26x=10x+28</span>
22+2-2*2-2+2-2-2=16
22-22+22-2-2-2=16
2*2*2*2+2+22:22=19
22+22:2+22:22=23
22-2-2-2-2+2-2:2=15
Ответ:
(68-2*16):2.......................