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12=s+(s+3)+(s+5)
We simplify the equation to the form, which is simple to understand
12=s+(s+3)+(s+5)
Remove unnecessary parentheses
+12=+s+s+3+(+s+5+)
Remove unnecessary parentheses
+12=+s+s+3+s+5
We move all terms containing s to the left and all other terms to the right.
-1s-1s-1s=+3+5-12
We simplify left and right side of the equation.
-3s=-4
We divide both sides of the equation by -3 to get s.
s=1.33333333333
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