90-45:5*3+9*2:3 =69
45:5=9
9•3=27
9•2=18
18:3=6
90-27=63
63+6=69
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90-45:5*3+9*2:3 =69
45:5=9
9•3=27
9•2=18
18:3=6
90-27=63
63+6=69