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x in (-oo:+oo)
y-9 = (-2/3)*(x-16) // - (-2/3)*(x-16)
y-((-2/3)*(x-16))-9 = 0
(2/3)*(x-16)+y-9 = 0
2/3*(x-16)+y-9 = 0
2/3*(x-16)+y-9 = 0
2/3*x+y-32/3-9 = 0
2/3*x+y-59/3 = 0
2/3*x+y-59/3 = 0
2/3*x+y-59/3 = 0 // - y-59/3
2/3*x = -(y-59/3) // : 2/3
x = (-(y-59/3))/2/3
x = 3/2*(59/3-y)
x = 3/2*(59/3-y)
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