Question

21)-2 (y + 4) = -7+9 (y - 1)

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Answer 1

Resposta:

$-2(y+4)=-7+9(y-1)\\ \\ -2y-8=-7+9y-9\\ \\ -2y-9y=-7-9+8\\ \\ -11y=-16+8\\ \\ -11y=-8\\ \\ 11y=8\\ \\ y={8\over11}\\ \\ S=\{{8\over11}\}$