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(1/3)*x+2*(1/3)*x_15 = 0
1/3*x+2/3*x_15 = 0 // - 2/3*x_15
1/3*x = -(2/3*x_15) // : 1/3
x = (-(2/3*x_15))/1/3
x = -2*x_15
x = -2*x_15
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