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= 3 + 4
= 7
b. - 2
= 4 - 2.3
= 4 - 6
= - 2
c. 2 -
= 2.5 - 4
= 10 - 4
= 6
d. 3 - 12 + 2
= 3.2 - 12.3 + 2.4
= 6 - 36 + 8
= -22