16.9/x=13怎么解方程

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1.2/9×（x＋1）＝6
=> (x + 1) = 6 * 9/2 = 27
=> x = 27 -1 = 26
2.x = 1.2 * 4/13 = 4.8/13 = 48 / 130 = 24 / 65
3.16.9×（3 - 2x）＝0
=> 3(16.9)- 2(16.9)x = 0
=> 3(16.9) = 2(16.9)x
=> x = 3(16.9)/2(16.9) = 3/2