Evaluate: -1 >= 7-d

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Expression: $-1 \geq 7-d$

Move the variable to the left-hand side and change its sign

$-1+d \geq 7$

Move the constant to the right-hand side and change its sign

$d \geq 7+1$

Add the numbers

$\begin{align*}&d \geq 8 \\&\begin{array} { l }d \in \left[ 8, +\infty\right\rangle\end{array}\end{align*}$

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