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