<span>в задании не поставлены скобки!!!
(3a-5b+7)/(8a-4b+7) =6
</span>3а-5b+7=48а-24b<span>+42
45а-19</span>b<span>+35=0
45а-19</span>b<span>+35+5=0+5
45а-19</span><span>b</span><span>+40=5
</span>
5y - 12 = 7y + 6
5y - 7y = 12 + 6
- 2y = 18
y = - 9
При х=-6 36-6p+q=0 q=6p-36
при х=2 4+2p+q=0 4+2p+6p-36=0 8p=32 p=4
q=6*4-36=-12