Answers edited by Black Widow

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• How to find the determinant of the matrix here ?
  
• How do you solve #2( x - 7) = 12#?
  
• What is #32/57-:16/19#?
  
• How do you solve #x + 9 = 2(x - 1)^2#?
  
• How do you solve #2(c + 15) = 4c + 3 #?
  
• How do you solve #6( x - 2) + 2( x + 1) \geq 10( x + 1)#?