Ay - 5a -5x +xy = (ay +xy) + (-5a -5x) = y(a + x) - 5(a + x) = (a +x)(y - 5)
<span>5/12y+1.3=0.53+7/8y
</span>5/12y-7/8y=0.53-1.3
-11/24у= -0.77
у= -0.77:-11/24
у=16.8
Ответ:у=16.8
23 - 3b - 3 + 30b - 35 - 21b + 7 = 0
-3b + 30b - 21b = - 23 + 3 + 35 - 7
6b = 8
b = 8 : 6
<u>b = 1цел.1/3</u>