-15- (3-7) + 6 *(-2) +(-8) -9
= -15-(-4) +(-12) - 8 -9
=-15 + 4 -12 -8 -9
= -11 -12 -8 -9
=- -40
-15 - (3-7) + 6 * (-2) + (-8) - 9
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