x (x + 12) = 3 / 5
3(x + 12) = 5 * x
3x + 36 = 5x
36 = 5x - 3x
36 = 2x
x = 36 : 2
x = 18
odp. D
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x (x + 12) = 3 / 5
3(x + 12) = 5 * x
3x + 36 = 5x
36 = 5x - 3x
36 = 2x
x = 36 : 2
x = 18
odp. D