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Explanation. Rearrange unknown terms to the left side of the equation:0.5 s - 4.5 s = 7 -1. Combine like terms:- 4 s = 7 -1. Calculate the sum or difference:- 4 s = 6. Divide both sides of the equation by the coefficient of variable: s = - \dfrac {6} {4} s = −46.
