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9/6x-2/3x=7
5/6x=7
x=7.6/5
x=8,4
2). 2/9(5-3x)-4=5/8x
10/9-2/3x-4=5/8x
26/9=31/24x. ---------->31/24x=26/9
x=624/279
x=208/93