MARK BRAINLIEST!!
So your solution is.
=−5

Put it back into the equation,

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The answer to your question is 9
Answer:
21
Step-by-step explanation:
Since this is an equilateral triangle, all sides are equal.
3x-6 = 2x+3
Move like terms to one side
x = 9
Now we plug 9 back in for x
2(9) + 3
=18 + 3
=21