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Geometry

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Moderate

Perimeter: Equilateral Triangle/Two Sides Given/Solve for x

GEOM-THSTLN

Triangle ABC is an equilateral triangle. $AB=2x+6$ and $BC=5x-12$.

Find the perimeter of triangle $ABC$.

A

$6$

B

$18$

C

$36$

D

$42$

E

$54$