\(\text{4x + 12 = 3x - 21}\)
\(\Leftrightarrow4x-3x=-21-12\)
\(\Leftrightarrow x=-33\)
Tìm x biết :
4x + 12 = 3x - 21
=> 4x - 3x = -21 - 12
=> x = -33
\(4x+12=3x-21\)
\(\Leftrightarrow4x-3x=-21-12\)
\(\Leftrightarrow x=-33\)
\(V\text{ậy}\)\(x=-33\)
\(4x+12=3.x-21\)
\(\Rightarrow12+21=3.x-4x\)
\(\Rightarrow33=-x\)
\(\Rightarrow x=-33\)
\(4x+12=3x-21\)
\(\Rightarrow4x-3x=-21-12\)
\(\Rightarrow x=-33\)
