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9*x-(3*((2/3)*x+5)) = -204 // + 204
9*x-(3*((2/3)*x+5))+204 = 0
9*x-3*((2/3)*x+5)+204 = 0
9*x-3*(2/3*x+5)+204 = 0
9*x-3*(2/3*x+5)+204 = 0
7*x-15+204 = 0
7*x+189 = 0
7*x+189 = 0
7*x+189 = 0 // - 189
7*x = -189 // : 7
x = -189/7
x = -27
x = -27
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