Question 390162
I'll do the first one to get you started.



{{{-2(a-3)=6}}} Start with the given equation.



{{{-2a+6=6}}} Distribute. (note: this is where you made a mistake)



{{{-2a=6-6}}} Subtract {{{6}}} from both sides.



{{{-2a=0}}} Combine like terms on the right side.



{{{a=(0)/(-2)}}} Divide both sides by {{{-2}}} to isolate {{{a}}}.



{{{a=0}}} Reduce.



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Answer:


So the solution is {{{a=0}}} 



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Jim