(-15)+8÷(-2)-3[4-{(-3)×(-7)-3+5}]
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(-15)+(-3)-3[4-{(-3)×(-7)-3+5}]
(-15)+(-3)-3[4-{21-8}]
(-15)+(-3)-3[4-{13}]
(-15)+(-3)-3[-9]
(-15)+(-3)-(-27)
(-15)+(-3)+27
(-18)+27
9
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