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y = (c + ab)/2
b) b - dv = -ay
y = (b - dv)/-a
c) ay = 4ay - d + c
-3ay = -d +c | : (-3a)
y = d/3a - c/3a
d) 3by = 2by +z + a
by = z + a
y = z/b + a/b
2y-ab=c
2y=a+ab /:2
y=a+ab/2
y-0,5ab=0,5c/:-0,5ab
y=-abc
b=-ay+dv
ay
=dv-b/:a
y=(dv-b):a
ay-c=4ay-d
y(a-4a)=c-d
y=(c-d):(-3a)
3by-z-a=
by=a+z/:b
y=(a+z):b