$$[ 124 - \{ ( 48 + 6 + 4 \times 3 - ( - 9 ) ) \} ]$$
$49$
$$124-\left(54+4\times 3-\left(-9\right)\right)$$
$$124-\left(54+12-\left(-9\right)\right)$$
$$124-\left(66-\left(-9\right)\right)$$
$$124-\left(66+9\right)$$
$$124-75$$
$$49$$
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$7^{2}$
