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x_2 in (-oo:+oo)
(1/5)*x_2 = 12 // - 12
(1/5)*x_2-12 = 0
1/5*x_2-12 = 0 // + 12
1/5*x_2 = 12 // : 1/5
x_2 = 12/1/5
x_2 = 60
x_2 = 60
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