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b) x= -234-9 》-243
c) x= 12+9 》21
d) -15+8 =x 》-7
e) x= -78+23 》-51
f) x= -22-6 》-28
g) 19+6 =x 》25
h) -14-20 =x 》34
i) x= -9+5 》-4
j) -7 =623+x
-7-623 =x 》-730
k) -2+723 =x 》-721
l) x= -25+9 》-16