Question 565195
{{{12y+21=9y}}} Start with the given equation.



{{{12y=9y-21}}} Subtract {{{21}}} from both sides.



{{{12y-9y=-21}}} Subtract {{{9y}}} from both sides.



{{{3y=-21}}} Combine like terms on the left side.



{{{y=(-21)/(3)}}} Divide both sides by {{{3}}} to isolate {{{y}}}.



{{{y=-7}}} Reduce.



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Answer:


So the solution is {{{y=-7}}} 

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