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y(2a+z)=c
2a+z=c/y
z=c/y-2a
b) (1/z) + ab = c
1/z=c-ab /*z
1=cz-abz
1=z(c-ab) /:(c-ab)
z=1/(c-ab)
c) d - (1/za) = b /*za
dza-1=bza
dza-bza=1
z(da-ba)=1
z=1/[a(d-b)]
d) a-z²b = z²c
-z²b-z²c=-a
z²b+z²c=a
z²(b+c)=a
z²=a/(b+c)
z=wszystko pod pierwiastkiem a/(b+c)
e) az² - bc = c (z² + a)
az²-c(z²+a)=bc
az²-cz²-ca=bc
az²-cz²=bc+ca
z²(a-c)=bc+ca
z²=(bc+ca)/(a-c)
z=wszystko pod pierwiastem [c(b+a)]/(a-c)
f) (a/b) =(1-z²)/c
ac=b(1-z²)
ac/b=1-z²
-z²=ac/b-1
z²=1-ac/b
z²=b/b-ac/b
z²=(b-ac)/b
z=wszystko pod pierwiastkiem (b-ac)/b