3x+12=24. 100+x=300 200-x=5 12+x=30

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1. 3x+12=24.

    3x=24-12

   3x=12

   x=12:3

   x=4

   100+x=300

   x=300-100

   x=200

   200-x=5

   x=200-5

   x=195

   12+x=30

   x=30-12

   x=18

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2. `3x + 12 = 24`

   `3x = 24 – 12`

   `3x = 12`

   `x = 12 : 3`

   `x = 4`

   `100 + x = 300`

   `x = 300 – 100`

   `x = 200`

   `200 – x = 5`

   `x = 200 – 5`

   `x = 195`

   `12 + x = 30`

   `x = 30 – 12`

   `x = 18`

    

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