Bài làm
17x - 28 = 12x - ( -42 )
=> 17x - 28 = 12x + 42
=> 17x - 12x = 42 + 28
=> 5x = 70
=> x = 14
Vậy x = 14
\(17x-28=12x-\left(-42\right)\)
\(17x-28=12x+42\)
\(17x-12x=42+28\)
\(5x=70\)
\(x=14\)
Vậy \(x=14\)
17x - 28 = 12x - ( - 42 )
<=> 17x - 28 = 12x + 42
<=> 17x - 12x = 42 + 28
<=> 5x = 70
<=> x = 14
trần nhật quỳnh đung rồi bạn
17x - 28 = 12x - ( - 42 )
17x - 28 = 12x + 42
17x - 12x = 42 + 28
5x = 70
x = 14
\(17x-28=12x-9-\left(-42\right)\)
\(\Leftrightarrow17x-28=12x-9+42\)
\(\Leftrightarrow17x-28=12x+33\)
\(\Leftrightarrow17x-28-12x-33=0\)
\(\Leftrightarrow5x-61=0\Leftrightarrow x=\frac{61}{5}\)
