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x in (-oo:+oo)
2 = (4/5)*x-(2*x)+8 // - (4/5)*x-(2*x)+8
2*x-((4/5)*x)-8+2 = 0
(-4/5)*x+2*x-8+2 = 0
6/5*x-6 = 0 // + 6
6/5*x = 6 // : 6/5
x = 6/6/5
x = 5
x = 5
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