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14 June, 23:48

7 (90-x) - 3 (180-x) = 30

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  1. 15 June, 02:21
    0
    180-x=3 (90-x) + 30

    We move all terms to the left:

    180-x - (3 (90-x) + 30) = 0

    We add all the numbers together, and all the variables

    -x - (3 (-1x+90) + 30) + 180=0

    We add all the numbers together, and all the variables

    -1x - (3 (-1x+90) + 30) + 180=0

    We calculate terms in parentheses: - (3 (-1x+90) + 30), so:

    3 (-1x+90) + 30

    We multiply parentheses

    -3x+270+30

    We add all the numbers together, and all the variables

    -3x+300

    Back to the equation:

    - (-3x+300)

    We get rid of parentheses

    -1x+3x-300+180=0

    We add all the numbers together, and all the variables

    2x-120=0

    We move all terms containing x to the left, all other terms to the right

    2x=120

    x=120/2

    x=60

    So sorry if it's wrong I tried
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