Question

1. 7+5r+3+5=1+7r2. 8n-7=7n-143. -4+6k+8=-4-7k4. 4+7n=6n+2n5. 15-7m=-5-2m

Answer 1

`\begin{gathered} 7+5r+3+5=1+7r \\ 15+5r=1+7r \\ 15-1=7r-5r \\ 14=2r \\ r=(14)/(2) \\ r=7 \end{gathered}`
`\begin{gathered} 8n-7=7n-14 \\ 8n-7n=-14+7 \\ n=-7 \end{gathered}`
`\begin{gathered} -4+6k+8=-4-7k \\ 4+6k=-4-7k \\ 4+4=-7k-6k \\ 8=-13k \\ k=-(8)/(13) \end{gathered}`
`\begin{gathered} 4+7n=6n+2n \\ 4=8n-7n \\ n=4 \end{gathered}`
`\begin{gathered} 15-7m=-5-2m \\ 15+5=-2m+7m \\ 20=5m \\ m=(20)/(5) \\ m=4 \end{gathered}`