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x in (-oo:+oo)
x = (1/10)*y-12 // - (1/10)*y-12
x-((1/10)*y)+12 = 0
x+(-1/10)*y+12 = 0
x-1/10*y+12 = 0 // - 12-1/10*y
x = -(12-1/10*y)
x = -(12-1/10*y)
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