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x in (-oo:+oo)
(-1/4)*(x-4) = -4 // + 4
(-1/4)*(x-4)+4 = 0
4-1/4*(x-4) = 0
4-1/4*(x-4) = 0
5-1/4*x = 0
5-1/4*x = 0
5-1/4*x = 0 // - 5
-1/4*x = -5 // : -1/4
x = -5/(-1/4)
x = 20
x = 20
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