Hey!
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Steps to Solve:
~Multiply 3 to both sides
d/3 * 3 - 10 * 3 = -2 * 3
~Simplify
d - 30 = -6
~Add -30 to both sides
d - 30 + -30 = -6 + 30
~Simplify
d = 24
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Answer:
[tex]\boxed{ \bf d~=~24}[/tex]
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Hope This Helped Good Luck!