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25 August, 12:46

What's (2/5) x-8=9 - (3/5)

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  1. 25 August, 13:14
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    41

    Step-by-step explanation:

    (2/5) x - 8 = 9 - (3/5)

    First you need to multiply everything with inversely proportional number of 2/5 to get x alone.

    (2/5) x - 8 = 9 - (3/5) / * 5/2

    x - (8 * 5/2) = 9 * 5/2 - (3/5 * 5/2)

    x - 40/2 = 45/2 - 15/10

    Now you switch 40/2 on the other side, but when you do this, you need to change it's sing (minus to plus). We do that so x can be alone on one side.

    x = 45/2 - 15/10 + 40/2, contracted, it look like this:

    x = 22,5 - 1,5 + 20

    and x = 41
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