Question

qual é o valor de x?
$\bf7x - 3(5x + 2) = 4$
​

Answer 1

$\Large\displaystyle\begin{gathered} \sf{ 7x-3(5x+2)=4} \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{ 7x-15x-6=4} \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{-8x-6= 4} \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{ -8x=4+6} \end{gathered}$

$\Large\displaystyle\begin{gathered} \sf{ -8x=10} \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{ x=-\frac{5}{4}}}} \end{gathered} }$