<span>(7y+1)⋅(7y−5)=(49y−6)(y+1)= 1/71</span>
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3х-7=4х-6х+12
3х-4х+6х=12+7
5х=19
х=3 4/5=3,8
Х-5+х+2х=115
4х=120
х=120:4
х=30кг
30-5=25кг
30*2=60кг
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