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5*x-(2*(-6/5)*x) = 51 // - 51
5*x-(2*(-6/5)*x)-51 = 0
5*x+(12/5)*x-51 = 0
37/5*x-51 = 0 // + 51
37/5*x = 51 // : 37/5
x = 51/37/5
x = 255/37
x = 255/37
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