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3*((5*x-8)/6+7)-3 = 18 // - 18
3*((5*x-8)/6+7)-18-3 = 0
3*((5*x-8)/6+7)-18-3 = 0
5/2*x-3-1 = 0
5/2*x-4 = 0
5/2*x-4 = 0
5/2*x-4 = 0 // + 4
5/2*x = 4 // : 5/2
x = 4/5/2
x = 8/5
x = 8/5
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