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x in (-oo:+oo)
y-8 = (9/16)*(x-7) // - (9/16)*(x-7)
y-((9/16)*(x-7))-8 = 0
(-9/16)*(x-7)+y-8 = 0
y-9/16*(x-7)-8 = 0
y-9/16*(x-7)-8 = 0
y-9/16*x-8+63/16 = 0
y-9/16*x-65/16 = 0
y-9/16*x-65/16 = 0
y-9/16*x-65/16 = 0 // - y-65/16
-9/16*x = -(y-65/16) // : -9/16
x = (-(y-65/16))/(-9/16)
x = -16/9*(65/16-y)
x = -16/9*(65/16-y)
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