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= -6 x -9
= 54
5. -6 + (6:2)-((-3)x 3)
= (-6+3) + 9
= -9+9
= -18
6. a. (-12 + 17) x 8 + 12
= 5 x 8 + 12
= 40+12
= 52
b. 24 x (-12):4-(-10)
= -288 : 4 + 10
= -72 + 10
= -62
c. 120 : (-10) x 8+(-20)
= (-12) x 8 + (-20)
= (-96) + (-20)
= -116
7. 25° C