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ax=dx+e-bc
x=(dx+e-bc):a
x:x=(d+e-bc):a
2)ax-b/:c=d
x=(a-b/:c):d
3)2ax-b=2x+c
2ax=2x+c+b
2x=(2x+c+b):a
2x:2x=(c+b):a
4)a+x/:x=b
x/:x=b-a
ax-dx = e - bc
x(a-d) = e-bc /:(a-d)
x = (e-bc):(a-d)
2) ax-b/:c=d /*c
ax - b = cd /+b
ax = cd + b /:a
x = (cd+b):a
3) 2ax-b=2x+c
2ax - 2x = c + b
2x(a-1) = c+b /:(a-1)
2x = (c+b):(a-1) /*1/2
x = 1/2*(c+b)*(a-1)
4) nie wiem
Pozdrawiam ;)