Solve for s
s=-18
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9\times 4=s\left(-2\right)
Variable s cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 9s, the least common multiple of s,9.
36=s\left(-2\right)
Multiply 9 and 4 to get 36.
s\left(-2\right)=36
Swap sides so that all variable terms are on the left hand side.
s=\frac{36}{-2}
Divide both sides by -2.
s=-18
Divide 36 by -2 to get -18.
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