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7s - 3s + 4 = 12
We simplify the equation to the form, which is simple to understand
7s-3s+4=12
We move all terms containing s to the left and all other terms to the right.
+7s-3s=+12-4
We simplify left and right side of the equation.
+4s=+8
We divide both sides of the equation by 4 to get s.
s=2
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