-72: [15-23] x (-21)+45 =
[tex] - 72 \div (15 - 23) \times ( - 21) + 45 \\ ( - 72 \div ( - 8)) \times ( - 21) + 45 \\ 9 \times ( - 21) + 45 \\ - 189 + 45 \\ - 144[/tex]
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[tex] - 72 \div (15 - 23) \times ( - 21) + 45 \\ ( - 72 \div ( - 8)) \times ( - 21) + 45 \\ 9 \times ( - 21) + 45 \\ - 189 + 45 \\ - 144[/tex]