9(x+2y)2-4(x-2y) -13
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(9x+18y)2-4x+8y-13=0
18x+36y-4x+8y=13
18x-4x+36y+8y=13
14x+44y=13
18x+36y-4x+8y=13
18x-4x+36y+8y=13
14x+44y=13
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