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4*x-(3*((4/3)*x-7)) = 15 // - 15
4*x-(3*((4/3)*x-7))-15 = 0
4*x-3*((4/3)*x-7)-15 = 0
4*x-3*(4/3*x-7)-15 = 0
4*x-3*(4/3*x-7)-15 = 0
21-15 = 0
6 = 0
6 = 0
x belongs to the empty set
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