100-40=60
60-30=30
30-18=12
12-12=00
40+30+18+12=100
60+30+12=102
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60+30+12-102=?
90+12-102
102-102
=0
...
thank u
90+12-102
102-102
=0
...
thank u
Anonymous:
(:-)
pls
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