Answer
$a=-2$
Work Step by Step
$3a+5=-1$ $\longrightarrow$addition property
$3a+5-5=-1-5$ $\longrightarrow$combine like terms
$3a=-6$ $\longrightarrow$multiplication property
$3a\div3=-6\div3$ $\longrightarrow$divide
$a=-2$
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