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y=-1は方程式2-1/3(m-y)yの解 2-1/3(m-(-1))=2(-1) -1/3(m+1)=-4 m+1=12 m=11 x+4=m(2x+4) x+4=11(2x+4) x+4=22x+44 21x=-40 x=-40/21
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