1. 5x+9
2. 5x+9=18
<=> 5x=9
<=> x=9/5
3. 5x+9=2x
<=> 3x=9
<=> x=3
Voilà
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1. 5x+9
2. 5x+9=18
<=> 5x=9
<=> x=9/5
3. 5x+9=2x
<=> 3x=9
<=> x=3
Voilà