Write a two column proof. Given 7y=8x-14; y=6 prove x=7

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?????????????????? "2-kolumn pruef" ????????????????? . . . . 7y=8x-14 . . . y=(8/7)x-2 . . . y=6...(8/7)x-2=6, so (8/7)x=6+2=8 . . . x=8*(7/8)=7 . . . .
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