<span>cry(pi*x/12)=1
</span>π/12*x=π/4+πN
<span>x=3+12N
N=0
X=3 </span>
10 + 2x = - 5x - 25
2x + 5x= - 25 - 10
7x = - 35
x = - 35/ 7
x = -5
Элементарно, Ватсон!
-8*(-3+12):36+2= -8*9:36+2=-72:36+2=-2+2=0
ответ б
5b/9+2=1/3
5b+2*9=3
5b=3-18
5b=-15
b=-3
x/2+2=x+4/84
42x+84*2=84x+4
168-4=84x-42x
164=42x
82=21x
x= 82/21