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x in (-oo:+oo)
2*x-(y/5) = 9 // - 9
2*x-(y/5)-9 = 0
2*x-1/5*y-9 = 0 // + -1/5*y-9
2*x = -(-1/5*y-9) // : 2
x = (-(-1/5*y-9))/2
x = (9-(-1/5*y))/2
x = (9-(-1/5*y))/2
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