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x in (-oo:+oo)
-(4-x) = (3/5)*(x-6) // - (3/5)*(x-6)
x-((3/5)*(x-6))-4 = 0
(-3/5)*(x-6)+x-4 = 0
x-3/5*(x-6)-4 = 0
x-3/5*(x-6)-4 = 0
2/5*x-4+18/5 = 0
2/5*x-2/5 = 0
2/5*x-2/5 = 0
2/5*x-2/5 = 0 // + 2/5
2/5*x = 2/5 // : 2/5
x = 2/5/2/5
x = 1
x = 1
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