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x in (-oo:+oo)
-2.1 = (4.6-x)/(-5) // - (4.6-x)/(-5)
-((4.6-x)/(-5))-2.1 = 0
(-1*(4.6-x))/(-5)-2.1 = 0
(-1*(4.6-x))/(-5)+(-5*(-2.1))/(-5) = 0
-1*(4.6-x)-5*(-2.1) = 0
x+5.9 = 0
(x+5.9)/(-5) = 0
(x+5.9)/(-5) = 0 // * -5
x+5.9 = 0
x+5.9 = 0 // - 5.9
x = -5.9
x = -5.9
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