Question

resolva essas equações pra mim

x-9x-8=0 
x-2x+4=0

Answer 1

$x-9x-8=0\\ -8x=8\\ x=8/(-8)\\ x=-1\\\\ S\{-1\}$

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$x-2x+4=0\\ -x=-4~~*~~(-1)\\ x=4\\\\ S\{4\}$

Answer 2

x-9x-8=0
-8x=8 .(-1)
 8x= - 8
  x= -8
        8
 x= - 1

x-2x+4=0
-x= -4 .(-1)
 x= 4