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x in (-oo:+oo)
2*x+y/3 = 7*x // - 7*x
2*x-(7*x)+y/3 = 0
2*x-7*x+y/3 = 0
1/3*y-5*x = 0 // - 1/3*y
-5*x = -(1/3*y) // : -5
x = (-(1/3*y))/(-5)
x = 1/15*y
x = 1/15*y
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