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x in (-oo:+oo)
x/5+4/5+12 = -20 // + 20
x/5+4/5+12+20 = 0
1/5*x+164/5 = 0 // - 164/5
1/5*x = -164/5 // : 1/5
x = -164/5/1/5
x = -164
x = -164
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