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az=cd-b /:a
z=cd-b :a
b)az+b=cz+d /-b
az=cz+d-b /-cz
az-cz=d+b/:a, -c
2z=d+b :a-c /2
z=d+b:2+a-c
c)a(zb)+cz=d
az+ab+cz=d /:2a, b, c
2z=d :2a+b+C
d)3(z+a)+bz=cz+d
3z+3a+bz=cz+d
3z+bz-cz=d-3a /:-c, b
5z=d-3a:-c+b
az=cd-b \ :a
z=(cd-b):a
b) az+b=cz+d \ -b
az=cz+d-b \ :a
z=(cz+d-b):a
c) c)a(zb)+cz=d
az+ab+cz=d \ :2a, b, c
2z=d :2a+b+c \ :2
z=2d :2a+b+c
d) 3(z+a)+bz=cz+d
3z+3a+bz=cz+d \ -3a
3z+bz=cz+d-3a \ :z
3+bz=c+d-3a \ -3
bz=c+d-3a-3 \ :b
z=(c+z-3a-3):b