115-6*с=73
6*с=115-73
6с=42
с=42/6
с=7
-------------------------
540/х+85=91
540/х=91-85
540/х=6
х=540/6
х=90
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115-6*с=73
6*с=115-73
6с=42
с=42/6
с=7
-------------------------
540/х+85=91
540/х=91-85
540/х=6
х=540/6
х=90