Tìm x biết: a,-x-4/3=-6/5 b,2/3-(-1/2-x)=-4/5 c,(-x-4/7)-(5/3+11/4)=-5/6

Tìm x biết:
a,-x-4/3=-6/5
b,2/3-(-1/2-x)=-4/5
c,(-x-4/7)-(5/3+11/4)=-5/6

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  1. `a) -x-4/3=-6/5`

    `-x=-6/5+4/3`

    `-x=-18/15+20/15`

    `-x=2/15`

    `x=-2/15`

    `b) 2/3-(-1/2-x)=-4/5`

    `-(-1/2-x)=2/3-(-4/5)`

    `1/2-x=2/3+4/5`

    `1/2-x=10/15+12/15`

    `1/2-x=22/15`

    `-x=22/15-1/2`

    `-x=44/30-15/30`

    `-x=29/30`

    `x=-29/30`

    `c) (-x-4/7)-(5/3+11/4)=-5/6`

    `(-x-4/7)-(20/12+33/12)=-5/6`

    `(-x-4/7)-53/12=-5/6`

    `-x-4/7=-5/6+(-53/12)`

    `-x-4/7=-10/12-53/12)`

    `-x-4/7=-63/12`

    `-x-4/7=-21/4`

    `-x=-21/4+(-4/7)`

    `-x=-147/28-12/28`

    `-x=-159/28`

    `x=159/28`

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  2. `a)`  `x-4/3=-6/5`

    `⇔x=-6/5+4/3`

    `⇔x=2/15`

    `b)`  `2/3-(-1/2-x)=-4/5`

    `⇔2/3+1/2+x=-4/5`

    `⇔7/6+x=-4/5`

    `⇔x=-4/5-7/6`

    `⇔x=-59/30`

    `c)`  `(-x-4/7)-(5/3+11/4)=-5/6`

    `⇔-x-4/7-53/12=-5/6`

    `⇔-x-419/84=-5/6`

    `⇔-x=-5/6+419/84`

    `⇔-x=349/84`

    `⇔x=-349/84`

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