решить уровнения (R+5) х7-54=(R+5)х4
7R +35-54=4R+20
3R=39
R=13
7R-4R=20-35+543R=39R=39/3=13
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7R +35-54=4R+20
3R=39
R=13
7R +35-54=4R+20
7R-4R=20-35+54
3R=39
R=39/3=13