Answer :

[tex]4s-12=-5s+51\ \ \ \ /+12\\\\4s-12+12=-5s+51+12\\\\4s=-5s+63\ \ \ /+5s\\\\4s+5s=-5s+5s+63\\\\9s=63\ \ \ /:9\\\\9s:9=63:9\\\\s=7[/tex]
dewindtemily
4s-12=-5s+51
  +12=     +12
4s=-5s+63
+5s =+5s
9s=63
9/9=63/9
s=7

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