Помогите с уравнением! СРОЧНО! 80*b-3*90+430=1600/2
80*b-3*90+430=1600/2
80b-270+430=800
80b=800-430+270
80b=640
b=8
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80*b-3*90+430=1600/2
80b-270+430=800
80b=800-430+270
80b=640
b=8
80*b-3*90+430=1600/2
80b=800-430+270
80b=640
b=8