I will zap the first correct answer!
7(-4)3,4(-4)0
Start
3(-3)0,turn 4(-3)1, +3
Turn 7(-3)4,turn 3(-3)0, +3
Turn 3(-3)0,0(no operation)0, +3
So
3+3+3=9
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不知道我这种写法,别人能否看得懂。