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x in (-oo:+oo)
12 = -((23*x)/10)-20 // + -((23*x)/10)-20
(23*x)/10+12+20 = 0
23/10*x+32 = 0 // - 32
23/10*x = -32 // : 23/10
x = -32/23/10
x = -320/23
x = -320/23
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