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30 September, 23:24

3x + 4 = 13

By adding - 4 to both sides of the equation we say that + 4 and - 4 on the left side of this equation? each other out.

Algebra

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  1. 1 October, 02:49
    0
    The + 4 and the - 4 cancel each other out leaving

    3x = 9

    X = 9
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