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x in (-oo:+oo)
(4/5)*(x-3) = (1/2)*(3*x-16) // - (1/2)*(3*x-16)
(4/5)*(x-3)-((1/2)*(3*x-16)) = 0
(4/5)*(x-3)+(-1/2)*(3*x-16) = 0
4/5*(x-3)-1/2*(3*x-16) = 0
4/5*(x-3)-1/2*(3*x-16) = 0
28/5-7/10*x = 0
28/5-7/10*x = 0
28/5-7/10*x = 0 // - 28/5
-7/10*x = -28/5 // : -7/10
x = -28/5/(-7/10)
x = 8
x = 8
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