1.
15-{3+[64-2x(29-32:x)]:7}=10
{3+[64-2*(29-32:x)]:7}=15-10
3+[64-2*(29-32:x)]:7=5
[64-2*(29-32:x)]:7=5-3
[64-2*(29-32:x)]:7=2
64-2*(29-32:x)=2*7
64-2*(29-32:x)=14
2x(29-32:x)64-14
2x(29-32:x)=50
29-32:x=50:2
29-32:x=25
32:x=29-25
32:x=4
x=32:4
x=8
3.
x/2+3=y/4
5(x-y)=60
x-y=12,y=x-12
2x+12=y
2x+12=x-12
2x-x=-12-12
x=-24
y=-36
P:S:la 2 nu stiu scuze:)