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Calculați: a. 5+(-5)-(-6)-(+6)= b. -4+(-3)+3-(-5-7-8-11)= c. 7-(-12+27+3)-(8+13-12)-(-5-8)= d. 13-(5-7)-(3+12-9+12)-(5-18)= e. -12-(-14+1-9)-(8-5-5)-(+6+15)= f. (7+5-18)+(-15+20)-(12-18)=
g. (-8-25+20)-(3+9-17)-(-15+33)= ​