\left \{ {{(x-3y)^2-x^2=3y(3y-1)+3-6x(y+1)} \atop {\frac{x(x+3)}{2}-\frac{x}{2}+y=1+\frac{x^2}{2}}} \right.
\left \{ {{x^2-6xy+9y^2-x^2=9y^2-3y+3-6xy-6x} \atop {x(x+3)-x+2y=2+x^2}} \right.
\left \{ {{x^2-6xy+9y^2-x^2-9y^2+3y-3+6xy+6x=0} \atop {x^2+3x-x+2y-2-x^2=0}} \right.
\left \{ {{3y-3+6x=0} \atop {2x+2y-2=0}} \right.
\left \{ {{3y=3-6x} \atop {x+y-1=0}} \right.
\left \{ {{y=1-2x} \atop {x+1-2x-1=0}} \right.
\left \{ {{y=1-2x} \atop {-x=0}} \right.
\left \{ {{y=1-2x} \atop {x=0}} \right.
\left \{ {{y=1} \atop {x=0}} \right.
…
\left \{ {{\frac{x+3y}{x-y}=8} \atop {\frac{7x-13}{3y-5}=4}} \right.
mianownik nie może być 0
x\neq y
i
3y-5\neq0
3y\neq5
y\neq\frac{5}{3}\neq1\frac{2}{5}
\left \{ {{x+3y=8(x-y)} \atop {7x-13=4(3y-5)}} \right.
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