The perimeter of the triangle is 202cm. Using that find the value of x

Answer:
x = 13
Step-by-step explanation:
3x + 12 + 5x + 16 + 4x + 18 = 202
combine like terms
12x + 12 + 16 + 18 = 202
12x + 46 = 202
-46 -46
12x = 156
divide by 12
x = 13
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-Lil G
Add all the sides together (don´t forget parenthesis) Put the x´s with the x´s and the same with the other numbers. The subtract additional numbers from the total. The divide what left from the number in front of the x.
(3x + 12) + (5x + 16) + (4x + 18) = 202
8x + 28 + (4x + 18) = 202
12x + 46 = 202
- 46 -46
12x = 156
/12 /12
x = 13