[tex] \frac{s}{4} + 5 = 8 \\ 4( \frac{s}{4} + 5 ) = 4 \times 8 \\ s + 20 =32 \\ s = 32 - 20 \\ s = 12 [/tex]
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[tex] \frac{s}{4} + 5 = 8 \\ 4( \frac{s}{4} + 5 ) = 4 \times 8 \\ s + 20 =32 \\ s = 32 - 20 \\ s = 12 [/tex]