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x in (-oo:+oo)
y = (4/3)*x+7 // - (4/3)*x+7
y-((4/3)*x)-7 = 0
(-4/3)*x+y-7 = 0
y-4/3*x-7 = 0 // - y-7
-4/3*x = -(y-7) // : -4/3
x = (-(y-7))/(-4/3)
x = -3/4*(7-y)
x = -3/4*(7-y)
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