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Response from Антон Владимирович[+++++]
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Answer: x=-5; b≠±3 5 b+3 +x b-3 -6x b-3 b+3=0 5 b-3 +x b+3 -6x b-3 b+3=0 5b-15+bx+3x-6x b-3 b+3=0 bx-3x+5b-15 b-3 b+3=0 x b-3 +5 b-3 b-3 b+3=0 b-3 x+5 b-3 b+3=0 x+5 b+3=0 b-3≠0; b≠3 x+5=0; b+3≠0; b≠-3 x=-5; b≠±3
Answer: x=-5; b≠±3 5 b+3 +x b-3 -6x b-3 b+3=0 5 b-3 +x b+3 -6x b-3 b+3=0 5b-15+bx+3x-6x b-3 b+3=0 bx-3x+5b-15 b-3 b+3=0 x b-3 +5 b-3 b-3 b+3=0 b-3 x+5 b-3 b+3=0 x+5 b+3=0 b-3≠0; b≠3 x+5=0; b+3≠0; b≠-3 x=-5; b≠±3