помогите решить уравнения
d+1/5=4/7+3/7
f+4/5=4/7+3/7
b+2/5=4/7+3/7
д+1/5=7/7
д=1-1/5
д=4/5
f+4/5=7/7
f=1-4/5
f=1/5
b+2/5=7/7
b=1-2/5
b=3/5
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d+1/5=4/7+3/7
д+1/5=7/7
д=1-1/5
д=4/5
f+4/5=4/7+3/7
f+4/5=7/7
f=1-4/5
f=1/5
b+2/5=4/7+3/7
b+2/5=7/7
b=1-2/5
b=3/5