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a)-2[-4+3:(9+3+8)-2.(+4–5+2)] =
c) -7.(-2+5.(+8–3–64.(-7+1+4)]
e) +8.[-6+2:(+3–8+4)–7.(-2+7-6)]=
g) +4.(-3+8•(-5+3+4)+5.(+8-3-6)]
i) -2-[-6+3.(-7+2+6)-5.(+4–2–5)]​