Answer :

[tex]s=4t-7[/tex]

[tex]s+7=4t[/tex]

[tex] \frac{s+7}{4}=t [/tex]
s = 4t - 7
s + 7 = 4t - 7 + 7
s + 7 = 4t
   4        4
1/4s + 1 3/4 = t
s = 4(1/4s + 1 3/4) - 7
s = s + 7 - 7
s = s + 0
s = s


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