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OpenStudy (anonymous):
5(2x-3)-(x+9)=21
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OpenStudy (anonymous):
\[(10x−15)−(x+9)=21\] \[10x−15−x-9=21\] \[10x−x=21+15+9\] \[9x=45\] \[x=\frac{ 45 }{ 9 }\] x=5
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