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