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Tahjalyn
Tahjalyn Tahjalyn
  • 17-11-2014
  • Mathematics
Answered

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

Verified Answer :

luana
luana luana
  • 18-11-2014

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

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