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5.5x-1.3x=12.6       &nbs

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5.5x-1.3x=12.6                 
3.85+1.5x=6.1
6x-0.9=4.5                    
4×4.5-3x=6.33.
5.5x-1.3x=12.6       &nbs
5.5X-1.3X=12.6,
         4.2X=12.6,
    4.2X÷4.2=12.6÷4.2,
            X=3;
     3.85+1.5X=6.1,
3.85+1.5X-3.85=6.1-3.85,
     1.5X÷1.5=2.25÷1.5,
             X=1.5;
    6X-0.9=4.5,
6X-0.9+0.9=4.5+0.9,
     6X÷6=5.4÷6,
         X=0.9;
4×4.5-3X=6.33,
    18-3X=6.33,
       3X=18-6.33,
    3X÷3=11.67÷3,
        X=3.89.