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x in (-oo:+oo)
(-4/5)*(x-5) = (2/3)*(x-5) // - (2/3)*(x-5)
(-4/5)*(x-5)-((2/3)*(x-5)) = 0
(-4/5)*(x-5)+(-2/3)*(x-5) = 0
-4/5*(x-5)-2/3*(x-5) = 0
-4/5*(x-5)-2/3*(x-5) = 0
22/3-22/15*x = 0
22/3-22/15*x = 0
22/3-22/15*x = 0 // - 22/3
-22/15*x = -22/3 // : -22/15
x = -22/3/(-22/15)
x = 5
x = 5
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