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13 December, 03:42

Is - 2 (3x-7) equivalent to 19+12x-5-6x? YES or NO?

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  1. 13 December, 04:13
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    6. 6x-21=33+9x 7. - 15x=-5 (3x+7) 8. 16x-19=113-6x 9. - 19x-34=56-x 10. - 6 (4x+3) = 6 (4x-3) ?

    6. 6x-21 = 33 + 9x

    +21 + 21

    6x = 54 + 9x

    -9x - 9x

    -3x = 54

    /3 / 3

    x = - 18

    7. - 15x = - 5 (3x+7)

    First multiply the - 5 to the other numbers.

    -15x = - 15x - 35

    0x = - 35

    7 is impossible I believe.

    8. 16x-19 = 113-6x

    +6 + 6

    22x - 19 = 113

    + 19 + 19

    22x = 132

    /22 / 22

    x = 6

    9. - 19x - 34 = 56 - x

    +19x + 19x

    -34 = 56 + 18x

    -56 - 56

    -90 = 18x

    /18 / 18

    x = - 5

    10. - 6 (4x+3) = 6[4x-3]

    -24x - 18 = 24x - 18

    +18 + 18

    -24x = 24x

    x = 0, since only zero can make the equation true.
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