Tìm x
8 - 2x = 3x - 42
\(\Leftrightarrow-2x-3x=-42-8\)
\(\Leftrightarrow-5x=-50\)
\(\Leftrightarrow x=10\)
2x + 3x = 8 + 42
2x + 3x = 50
(2 + 3)x = 50
5x = 50
x = 50 : 5
x= 10
- Chúc bạn học tốt
C1:
\(8-2x=3x-42\\ \Leftrightarrow-2x-3x=-42-8\\ \Leftrightarrow-5x=-50\\ \Leftrightarrow5x=50\\ \Leftrightarrow x=10\)
C2 : \(8-2x=3x-42\\ \Leftrightarrow8+42=3x+2x\\ \Leftrightarrow50=5x\\ \Leftrightarrow x=10\)
8-2x=3x-42
<=>-2x-3x=-42-8
<=>-5x=-50
<=>x=10
8-2x=3x-42
2x+3x=8+42
(2+3)x=50
5x=50
x=50:5
x=10