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Properties of linear equations
1.    We can add the same number to both sides of the equation.
    Consider the example x – 8 = 12
    Additing 8 to both sides of the equation, 
    We have x – 8 + 8 = 12 + 8
        x + 0 = 20
       x  = 20

2.    We can subtract the same number from both sides of the equation.
     Ex.    z + 7 = 8
        Subtracting 7 from both sides of the equation, we have
        z + 7 = 8
             z + 7 – 7 = 8 – 7
             z + 0 = 1
           z = 1

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