х/5-х/6+х = -31/6 (*30)
30х/5-30х/6+30х = -31*30/6
6х-5х+30х = -31*5
31х = -31*5
х=-5
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х/5-х/6+х = -31/6 (*30)
30х/5-30х/6+30х = -31*30/6
6х-5х+30х = -31*5
31х = -31*5
х=-5