Problem 1
36/54=6/X
54*6=324
36/324=9

Problem 2
12/x=4/1
12*1
4/12
x=3

Problem 3
X-2/5- 10-X/8
5(10-X)
50-5X
8(X-2)
8x-16
50-5x=8x-16
+5x=+5X
50=13X-16
+16 +16
66/13=13X/13
X=5.1

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