\(\left(4.3x-4\right)-2=18\)
\(\Rightarrow12x-4-2=18\)
\(\Rightarrow12x=24\Leftrightarrow x=2\)
(4.3x - 4) - 2 = 18
<=> 12x - 4 = 20
<=> 12x = 24
<=> x = 2
\(\left(4.3x-4\right)-2=18\)
\(\Rightarrow12x-4-2=18\)
\(\Rightarrow12x-6=18\)
\(\Rightarrow12x=24\)
\(\Rightarrow x=2\)
\(\left(4.3x-4\right)-2=18\)
\(\Leftrightarrow12x-4=18+2\)
\(\Leftrightarrow12x-4=20\)
\(\Leftrightarrow12x=24\)
\(\Leftrightarrow x=2\)
Hoặc bn có thể làm như sau :
\(\left(4.3x-4\right)-x=18\)
\(\Leftrightarrow4\left(3x-1\right)=18+2\)
\(\Leftrightarrow4\left(3x-1\right)=20\)
\(\Leftrightarrow3x-1=5\)
\(\Leftrightarrow3x=6\)
\(\Leftrightarrow x=2\)
_Minh ngụy_
\(\left(4×3x-4\right)-2=18\)
\(\left(12x-4\right)-2=18\)
\(\left(12x-4\right)=18+2\)
\(12x-4=20\)
\(12x=20+4\)
\(12x=24\)
\(x=2\)
(12x-4)-2=18
(12x-4)=18+2
(12x-4)=20
12x-4=20
12-x=20:4
12-x=5
x=12-5
x=7
