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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
y-2/3*x-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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