Answer :

ayah1
3.5x-20=2.4x+13
-2.4x    -2.4x    
1.1x -20 = 13
       +20   +20
1.1x = 33
x = 30
3.5x-20=2.4x+13
3.5x=2.4x+33
1.1x=33
x=30

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