1) First way:
[tex]-5(-3+x) = 20[/tex]
=> [tex]15 - 5x = 20[/tex]
=> [tex]-5x = 20 -15[/tex]
=> [tex]-5x = 5[/tex]
=> [tex]x = 5/-5[/tex]
=> [tex]x = -1[/tex]
2) Second way:
[tex]-5(-3+x)=20[/tex]
=> [tex]-3+x = 20/-5[/tex]
=> [tex]- 3 + x = -4[/tex]
=> [tex]x = -4 + 3[/tex]
=> [tex]x = -1[/tex]
