Question 1008291
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The perimeter of a triangle is 51 m. The second is twice as long as the first side.the third side 
is 3 m less than three times the first. What are the lengths of the sides of the triangle?
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Let x be the length of the first side of the triangle in meters.
Then the second size is 2x m long, and the third size is 3x - 3 meters long.

The perimeter is x + 2x + (3x-3).

An equation is 

x + 2x + 3x - 3 = 51.

Solve it yourself please.
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