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x in (-oo:+oo)
x = (5*y)/10 // - (5*y)/10
x-((5*y)/10) = 0
x+(-1/2)*y = 0
x-1/2*y = 0 // + -1/2*y
x = -(-1/2*y)
x = 1/2*y
x = 1/2*y
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