exam Maths Puzzle Numerical Ability

I keep coming up with an false answer for this problem

.01x+3.1=2.03x-2.96

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exam Other Question

Could someone please help me with this i forgot how you get the perimeter of a triangle.
Side 1 = 4
Side 2 = sqrt 5 - sqrt 3
Side 3 = sqrt 5 + sqrt 3 63/144 = u/16