$$\frac{ 7 }{ 12 } - 2 \frac { 3 } { 5 } + \frac{ 1 }{ 2 }$$
$-\frac{91}{60}\approx -1.516666667$
$$\frac{7}{12}-\frac{10+3}{5}+\frac{1}{2}$$
$$\frac{7}{12}-\frac{13}{5}+\frac{1}{2}$$
$$\frac{35}{60}-\frac{156}{60}+\frac{1}{2}$$
$$\frac{35-156}{60}+\frac{1}{2}$$
$$-\frac{121}{60}+\frac{1}{2}$$
$$-\frac{121}{60}+\frac{30}{60}$$
$$\frac{-121+30}{60}$$
$$-\frac{91}{60}$$
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$-\frac{91}{60} = -1\frac{31}{60} = -1.5166666666666666$
