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a). 2y - ab = c
2y=c+ab
y=(c+ab)/2
b). b = -ay + dv
-ay=b-dv
y=(b-dv)/-a
y=(dv-b)/a
c). ay - c = 4ay - d
ay-4ay=-d-c
y(a-4a)=-d-c
y=(-d-c)/-3a
y=(d+c)/3a
2..
a). z/a = b/z |*z *a
z²=ba
z=√ba
2y=c +ab /:2
y=c+ab/2
b = -ay + dv / *(-1)
-b=ay-dv /+dv
-b+dv=ay /:a
y= -b+dv/a
ay - c = 4ay - d
ay-4ay=-d+c
-3ay=c-d /: (-1)
3ay=-c+d /:3a
y=-c+d/3a
2Y=C+AB/:2
Y=C+AB/2
b) b=-ay+dv
ay=dv-b/:a
y=dv-b/a
c)ay-c=4ay-d
ay-4ay=c-d
-3ay=c-d/: (-3a)
y=c-d/-3a