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72/9 = 3*x-3*4*x // - 3*x-3*4*x
72/9-(3*x)-(-3*4*x) = 0
12*x-3*x+72/9 = 0
9*x+8 = 0 // - 8
9*x = -8 // : 9
x = -8/9
x = -8/9
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