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8.7+s=12.1
We simplify the equation to the form, which is simple to understand
8.7+s=12.1
We move all terms containing s to the left and all other terms to the right.
+1s=+12.1-8.7
We simplify left and right side of the equation.
+1s=+3.4
We divide both sides of the equation by 1 to get s.
s=3.4
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