(+3)☆(+15)=+18
(-14)☆(-7)=+21
(-2)☆(+14)=-16
(+15)☆(-8)=-23
0☆(-15)=+15
(+13)☆0=+13
请你认真思考上述运算,归纳☆运算的法则,并计算:(-11)☆[0☆(–12)]等于( )