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---- + ------ = ---- + ----
5 10 15 1
2(2x) + x x + 15(13)
---------------- = ----------------
10 15
4x + x x + 195
-------------- = -------------
10 15
15 ( 4x + x) = 10 (x + 195)
60x + 15x = 10x + 1950
60x + 15x - 10x = 1950
1950
65x = 1950 x = ------------ = 30
65
-----------------------------------------------------------
x 4
--- - x = x + ------- - 1
2 5
x - 2x 5x + 4 - 5
--------- = ----------
2 5
5 (x - 2x) = 2 (5x - 1)
5x - 10x = 10x - 2
-5x = 10x - 2 2
.5x - 10x = -2 x = --------
15