А) 4b+5+3b-3=7b+2
б)b-4+5b-7=6b-11
в)-7b+3 (b-1)=-7b+3b-3=-4b-3
г)(2b-4)-(3b-9)=2b-4-3b+9=-1b+5
д)7b+3 (b-1)=7b+3b-3=10b-3
e)4b-2 (b+3)=4b-2b-6=2b-6
( 8 - 7X)*( 8 + 7X) > 0
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8 - 7X > 0
8 > 7X
8/7 > X
X < 8/7
X < 1 1/7
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8 + 7X > 0
7X > - 8
X > - 1 1/7
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Ответ Х ∈ ( - 1 1/7 ; 1 1/7 )
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98 и т.д.