3. Simplify the following expressions.
a) -150+ [{(-24) - 50 + (-10 + 16 * 2-17)} +120]
b) 18+ (-15+3 of {-51+ 3 +62 - -5x5}]
c) 125 -[-20 of (-16) + {15+(-5)}]
d) -120 + [-45 - {15 - 10 * (-18 - 15)
plz help in these question plz
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