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x in (-oo:+oo)
x/5+(2*y)/3+45/5 = 0
1/5*x+2/3*y+9 = 0 // - 2/3*y+9
1/5*x = -(2/3*y+9) // : 1/5
x = (-(2/3*y+9))/1/5
x = -5*(2/3*y+9)
x = -5*(2/3*y+9)
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