-15+x+7=x-8
a+(-27)+48=a+21
y+43+(-36)=y+7
5,6+(-4,7)-c=0,9-c
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-15+x+7=x-8
a+(-27)+48=a+21
y+43+(-36)=y+7
5,6+(-4,7)-c=0,9-c