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