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x+90=5/3x //-x
90=2/3x //*3/2
135=x
135-x=135-(2/3*135) //-135
-x=-2/3*135//*(-1)
x=54
spr.war.zad.
135-53=81
81/135=3/5
odp. Należy odjąć 54.
Pozdrawiam