x+5=5(y-5) x-5=3(y+5)
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x+5=5(y-5) x-5=3(y+5)
x+5=5(y-5) x-5=3(y+5)
x+5=5(y-5) x-5=3(y+5)
x+5=5y-25
x-5=3y+15;
x=5y-30,
5y-30-5=3y+15,
2y=50
y=25
x=95
x+5=5(y-5) ①
x-5=3(y+5) ②
①÷②得到(X+5)/(X-5)=5/3
3(X+5)=5(X-5)
3X+15=5X-25
2X=40
X=20
代入解得y=10
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