haleybrooks haleybrooks

22-08-2018
Mathematics

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how do i work out 3(d-4)=9

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Shinrinyoku Shinrinyoku

23-08-2018

3(d−4) = 9

begin by distributing
(3)(d)+(3)(−4) =9

solve right side
3d + -12 = 9

add 12 to both sides
3d = 21

divide both sides by 3
d = 7

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