The equation $x=7$,in two variables,can be written as

  • A
    $1 \cdot x + 1 \cdot y = 7$
  • B
    $1 \cdot x + 0 \cdot y = 7$
  • C
    $0 \cdot x + 1 \cdot y = 7$
  • D
    $0 \cdot x + 0 \cdot y = 7$

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