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x in (-oo:+oo)
y/c+3*x = 4 // - 4
y/c+3*x-4 = 0
c^-1*y+3*x-4 = 0 // - c^-1*y-4
3*x = -(c^-1*y-4) // : 3
x = (-(c^-1*y-4))/3
x = (4-(c^-1*y))/3
x = (4-(c^-1*y))/3
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