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4*x-(3/7)-1 = (8/9)*x // - (8/9)*x
4*x-((8/9)*x)-(3/7)-1 = 0
4*x+(-8/9)*x-3/7-1 = 0
28/9*x-10/7 = 0 // + 10/7
28/9*x = 10/7 // : 28/9
x = 10/7/28/9
x = 45/98
x = 45/98
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