Evaluate: -1 >= 7-d

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

$d \geq 7+1$

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