Hey there!!
perimeter of rectangle = 2 ( l + b )
perimeter of a triangle = add up all the sides
2 ( x + 2 + x + 1 ) = x + 7 + x + 3 + x + 9
2 ( 2x + 3 ) = 3x + 19
4x + 6 = 3x + 19
x = 19 - 6
x = 13
Hope my answer helps!
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