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x in (-oo:+oo)
-88/5 = x-(4*x)+2/5 // - x-(4*x)+2/5
4*x-x-88/5-(2/5) = 0
4*x-x-88/5-2/5 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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