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((3*x)/5)*x_2 = -4 // + 4
((3*x)/5)*x_2+4 = 0
3/5*x*x_2+4 = 0 // - 4
3/5*x*x_2 = -4 // : 3/5*x_2
x = -4/(3/5*x_2)
x = -20/3*x_2^-1
x = -20/3*x_2^-1
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