4а+32-7а +7<span><12</span>
<span>4а-7а<span><12-32-7</span></span>
-3а <span><-27</span>
<span>а <span>→(знак больше:D) -27:(-3)</span></span>
<span><span>а <span>→ 9</span></span></span>
<span>4(а+8) - 7(а-1)<12</span>
<span>4a+32-7a+7<12</span>
<span>-3a+39<12</span>
<span>-3a<12-39</span>
<span>-3a<-27</span>
<span>a>9</span>
при a = 6.25; b = 23
Всё на листочке (на фото)