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x in (-oo:+oo)
4 = -2*x-8/10 // + -2*x-8/10
4-(-2*x)-(-8/10) = 0
2*x+4/5+4 = 0
2*x+24/5 = 0 // - 24/5
2*x = -24/5 // : 2
x = -24/5/2
x = -12/5
x = -12/5
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