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