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y=-2x+5
(x-1)²+(y+2)²=50
(x-1)²+(-2x+5+2)²=50
x²-2x+1+4x²-28x+49=50
5x²-30x+50=50
5x(x-6)=0
x1=0 y1=5
x2=6 y2=-7