First way. Distribute the 5 first.
In this way, we first remove the parentheses and isolate x later
By multipliying 5 by the term into the parentheses, we get
[tex]\begin{gathered} 20=5(-3)+5\cdot x \\ 20=-15+5x \end{gathered}[/tex]Now, if we move -15 to the left hand side as +15, we have
[tex]20+15=5x[/tex]which gives
[tex]\begin{gathered} 35=5x \\ \frac{35}{5}=x \\ x=7 \end{gathered}[/tex]that is, x is equal to 7.
Second way. Divide by 5 first
In this way, we first move 5 to the left hand side and isolate x later
If we move 5 to the left hand side, we have
[tex]\frac{20}{5}=-3+x[/tex]which gives
[tex]4=-3+x[/tex]if we move -3 to the left hand side as +3, we obtain
[tex]\begin{gathered} 4+3=x \\ 7=x \end{gathered}[/tex]so, we obtain the same result, x=7.