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x in (-oo:+oo)
(2/5)*x = (1/5)*x-12 // - (1/5)*x-12
(2/5)*x-((1/5)*x)+12 = 0
(2/5)*x+(-1/5)*x+12 = 0
1/5*x+12 = 0 // - 12
1/5*x = -12 // : 1/5
x = -12/1/5
x = -60
x = -60
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