SOLUTION
The first equation
[tex]\begin{gathered} 4.5x-7=20 \\ add\text{ 7 to both sides we have } \\ 4.5x-7+7=20+7 \\ 4.5x+0=27 \\ 4.5x=27 \\ x=\frac{27}{4.5} \\ x=6 \end{gathered}[/tex]
The answer is x = 6
The second equation
[tex]\begin{gathered} -3x+7=28 \\ subtracting\text{ 7 from both sides we have } \\ -3x+7-7=28-7 \\ -3x+0=21 \\ -3x=21 \\ x=\frac{21}{-3} \\ x=-7 \end{gathered}[/tex]
Hence the answer is x = -7
The last one
[tex]\begin{gathered} 2x+3=-7 \\ subtract\text{ 3 from both sides } \\ 2x+3-3=-7-3 \\ 2x+0=-10 \\ 2x=-10 \\ x=\frac{-10}{2} \\ x=-5 \end{gathered}[/tex]
hence the answer is x = -5
