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b in (-oo:+oo)
(1/7)*b+3*b-10 = -4/7 // + -4/7
(1/7)*b+3*b-(-4/7)-10 = 0
(1/7)*b+3*b+4/7-10 = 0
22/7*b-66/7 = 0 // + 66/7
22/7*b = 66/7 // : 22/7
b = 66/7/22/7
b = 3
b = 3
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