x - (4x - 7) = 5x - (x + 21)

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17-11-2014
Mathematics

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x - (4x - 7) = 5x - (x + 21)

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Luanaidn Luanaidn · Answer 1 · 2014-11-18T05:48:22-05:00

Luanaidn Luanaidn

18-11-2014

[tex]x-(4x-7)=5x-(x+21)\ \ \ \ | omit\ the\ brackets\\\\ x-4x+7=5x-x-21\\\\ -3x+7=4x-21\ \ \ | subtract\ 4x\\\\ -7x+7=-21\ \ \ | subtract\ 7\\\\ -7x=-28\ \ \ | divide\ by\ -7\\\\ x=4[/tex]

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