Answer :

-30 + 5x=12

5x=12+30

5x=42

x=42/5

x=8.4
-30 + 5x = 12.
5x = 12 +30.    Rearranging.
5x = 42.          Divide both sides by 5.
x = 42/5

x = 8/2/5  or 8.4.
Cheers.

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