Answer:
The variable x equals 9.
Explanation:
3x - 7 = 20
3x = 27
X = 9
x = 9
Isosceles means that the two sides equal each other
As such, to find the value of x we must equal the two expressions together and isolate the variable
20 = 3x - 7
add 7 to both sides
27 = 3x
divide both sides by 3
9 = x
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