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x in (-oo:+oo)
y+2 = (3/4)*(x-7) // - (3/4)*(x-7)
y-((3/4)*(x-7))+2 = 0
(-3/4)*(x-7)+y+2 = 0
y-3/4*(x-7)+2 = 0
y-3/4*(x-7)+2 = 0
y-3/4*x+2+21/4 = 0
y-3/4*x+29/4 = 0
y-3/4*x+29/4 = 0
y-3/4*x+29/4 = 0 // - y+29/4
-3/4*x = -(y+29/4) // : -3/4
x = (-(y+29/4))/(-3/4)
x = 4/3*(y+29/4)
x = 4/3*(y+29/4)
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