По подобию треугольников: 5.4x=(12+x)*1.85.4x=21.6+1.8x3.6x=21.6x=21.6/3.6 = 6
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По подобию треугольников:

5.4x=(12+x)*1.8
5.4x=21.6+1.8x
3.6x=21.6
x=21.6/3.6 = 6