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5/2x = (12 - 3x)/2
2 (5x) = 2 (12 - 3x)
10x = 24 - 6x
10x + 6x = 24
16x = 24
x = 24/16
x = 3/2
*x/3 - 2 = x/9
(x - 6)/3 = x/9
9 (x - 6) = 3x
9x - 54 = 3x
9x - 3x = 54
6x = 54
x = 54/6
x = 9
suerte :)