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6*x+36/4 = 3*x-4 // - 3*x-4
6*x-(3*x)+36/4+4 = 0
6*x-3*x+36/4+4 = 0
3*x+13 = 0 // - 13
3*x = -13 // : 3
x = -13/3
x = -13/3
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