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4/9-(4*x) = -6*x-(140/9) // + -6*x-(140/9)
4/9-(4*x)-(-6*x)+140/9 = 0
6*x-4*x+4/9+140/9 = 0
2*x+16 = 0 // - 16
2*x = -16 // : 2
x = -16/2
x = -8
x = -8
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