(49b²-9)*(1/7b-3-1/7b+3) - b+14=
= (49b²-9)*(0)-b+14 = 0-b+14 = -b+14
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(49b²-9)*(1/7b-3-1/7b+3) - b+14=
= (49b²-9)*(0)-b+14 = 0-b+14 = -b+14