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4 years ago

5

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

2 answers:

olya-2409 [2.1K]4 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]4 years ago

4 0

$3x+9 = 21+7x\\
4x=-12\\
x=-3$

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