exam Maths Puzzle Numerical Ability

I am confused on how to do page 539 #11

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C-9 On a right triangle I am having problems figuring out the degrees and inches. First triangle is one side 2 1/8" the other side is 2 5/8 " to find the missing quantity X. I squa 4x-3/5=3x+1/10 and 6x+3(x-0.2789)=4(2x+0.3912)
The two problems above are in the homework assignment, but the book doesn't get into how to solve them. Thanks in advance