Hãy tìm x: 30-3 (x - 2)= 18

Trả lời:

$30-3(x-2)=18$

$\Rightarrow$$3(x-2)=30-18$

$\Rightarrow$$3(x-2)=12$

$\Rightarrow$$x-2=12:3$

$\Rightarrow$$x-2=4$

$\Rightarrow$$x=4+2$

$\Rightarrow$$x=6$

$\text{Vậy}$ ${x=6}$