\(x+54=54-x\)
\(\Leftrightarrow x+x=54-54\)
\(\Leftrightarrow2x=0\)
\(\Leftrightarrow x=0\)
| \(x+x=54-54\)\(\Leftrightarrow2x=0\Leftrightarrow x=0\) | |
| \(x-x=43+43\Leftrightarrow0x=86\Leftrightarrow x=0\) |
x +54=54-x
x=0
x-43=43-x
x=0
đúng thì cho
\(x-43=43-x\)
\(\Leftrightarrow x+x=43+43\)
\(\Leftrightarrow2\times x=43\times2\)
\(\Rightarrow x=43\)
con...............................................................................me!
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