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(x-5)²+(y+2)²=3²
x²-10x+25+y²+4y+4=9
x²+y²-10x+4y+20=0
b.
(x+4)²+(y+5)²=6²
x²-8x+16+y²+10y+25=36
x²+y²-8x+10y+5=0