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