d ( - 3 ; - 6 )
a ( 4 ; - 7 )
3a = ( 3×4 ; 3 × (-7) ) = ( 12 ; - 21 )
3a + d = ( 12 - 3 ; - 21 - 6 ) = ( 9 ; - 27 )
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d ( - 3 ; - 6 )
a ( 4 ; - 7 )
3a = ( 3×4 ; 3 × (-7) ) = ( 12 ; - 21 )
3a + d = ( 12 - 3 ; - 21 - 6 ) = ( 9 ; - 27 )