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15 June, 17:58

Solve and check the following equation. 8d + 21 = 12d + 5

d =

+5
Answers (1)
  1. 15 June, 19:39
    0
    Subtract 8d from both sides

    21 = 12d + 5 - 8d

    Simplify 12d + 5 - 8d to 4d + 5

    21 = 4d + 5

    Subtract 5 from both sides

    21 - 5 = 4d

    Simplify 21 - 5 to 16

    16 = 4d

    Divide both side by 4

    16/4 = d

    Simplify 16/4 to 4

    4 = d

    Switch sides

    d = 4

    Check answer

    8d + 21 = 12d + 5

    Let d = 4

    8 * 4 + 21 = 12 * 4 + 5

    Simplify 8 * 4 to 32

    32 + 21 = 12 * 4 + 5

    Simplify 12 * 4 to 48

    32 + 21 = 48 + 5

    Simplify 32 + 21 to 53

    53 = 48 + 5

    Simplify 48 + 5 to 53

    53 = 53
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