Question 358952
I'll do the first one to get you started.


{{{3-4d=13}}} Start with the given equation.



{{{-4d=13-3}}} Subtract {{{3}}} from both sides.



{{{-4d=10}}} Combine like terms on the right side.



{{{d=(10)/(-4)}}} Divide both sides by {{{-4}}} to isolate {{{d}}}.



{{{d=-5/2}}} Reduce.



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Answer:


So the solution is {{{d=-5/2}}}