[tex]\sf Veja\: Abaixo[/tex]
Cálculos da A)
[tex]\Large\boxed{\begin{array}{lr} \large \sf \:5x+45=-5 \\ \\ \large \sf \:5x=-5-45 \\ \\ \large \sf \:5x=-50 \\ \\ \large \sf \:x=-\dfrac{50}{5} \\ \\ \large \sf \:x=-10 \end{array}}[/tex]
Resposta:
[tex]\Large\boxed{\sf -10}}[/tex]
Cálculos da B)
[tex]\Large\boxed{\begin{array}{lr} \large \sf \:21=3x+24\\ \\ \large \sf \:-3x=24-21 \\ \\ \large \sf \:-3x=3 \\ \\ \large \sf \:x=-\dfrac{3}{3} \\ \\ \large \sf \:x=-1 \end{array}}[/tex]
Resposta:
[tex]\Large\boxed{-1}[/tex]
Bons estudos =)
