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Alenkinab [10]
3 years ago
5

For what values of x is the following equation satisfied : 3x+9 = 21+7x ?

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
4 0
First of all, the first power of 'x' is the highest power in the whole equation,
so we only expect one solution.

You said that <span><u>3x+9 = 21+7x </u>

Subtract 3x from each side:

9 = 21 + 4x

Subtract 21 from each side:

-12 = 4x

Divide each side by 4 :

<u>-3 = x </u>
</span>


algol [13]3 years ago
4 0
3x+9 = 21+7x\\&#10;4x=-12\\&#10;x=-3
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