algebra

When 4 times a number is subtracted from 7 times the number, the result is 30.

which one is correct?

{3, -15, 10, or 0.9

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asked by Johnny
  1. 7 n - 4 n = 30
    3 n = 30
    n = 10

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    posted by Damon
  2. let the number be a 7a-150=0 ; 7a=150 divide by coefficient of a 7a/7=150/7 a=21.4

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    posted by VICTORY

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