## Algebra 1

$x=-(t+r)$
We are trying to isolate $x$ in the equation $\frac{x+r}{t}+1=0$ First, we subtract $1$ on both sides of the equation: $\frac{x+r}{t}=-1$ Next, we multiply both sides of the equation by $t$: $x+r=-t$ Finally, we subtract $r$ from both sides of the equation: $x=-t-r=-(t+r)$