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7/(x-5)=3/(x-3) /*(x-5)(x-3) , x≠3 i x≠5
7(x-3)=5(x-5)
7x-21=5x-25
7x-5x=-25+21
2x=-4 /:2
x=-2
b)
(x+3)/(x+2)=(2x-1)/x /*x(x+2) , x≠-2 i x≠0
x(x+3)=(2x-1)(x+2)
x²+3x=2x²+4x-x-2
-x²+2=0 /*(-1)
x²-2=0
(x+√2)(x-√2)=0
x=-√2 lub x=√2