Resposta:
[tex]\color{yellow} \large \boxed{ \boxed{ \tt x = - \frac{30}{b} \: : \: b ≠ 0 }}[/tex]
Explicação passo-a-passo:
[tex] \color{yellow}\large \boxed{ \boxed{\begin{array}{lr} \tt x b = - 30 \\ \\ \tt \frac{xb}{b} = \frac{ - 30}{b} \: : \: b ≠ 0 \\ \\ \: \tt x = \frac{ - 30}{b} \: : \: b ≠ 0 \end{array}}}[/tex]
[tex] \color{blue} \boxed{ \boxed{ \color{red} \tt duvidas \: deixe \:nos \: comentarios \: }}[/tex]
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[tex] \red{\large \boxed{ \boxed{ \color{yellow}\tt espero \: ter \: ajudado }}} \\ \\ \\ \\ \red{\large \boxed{ \boxed{ \color{yellow} \tt bons \: estudos}}}[/tex]
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[tex] \red{\large\boxed{ \large\boxed{ \color{yellow}\large \tt ASS =>> Starco \: \: Butterdiaz}}}[/tex]
