$$= ( - \frac { 7 } { 2 } ) \times \frac { 1 } { 12 } \times 298$$
$-\frac{1043}{12}\approx -86.916666667$
$$\frac{-7}{2\times 12}\times 298$$
$$\frac{-7}{24}\times 298$$
$$-\frac{7}{24}\times 298$$
$$\frac{-7\times 298}{24}$$
$$\frac{-2086}{24}$$
$$-\frac{1043}{12}$$
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$-\frac{1043}{12} = -86\frac{11}{12} = -86.91666666666667$
