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x in (-oo:+oo)
x/2-(x/5) = 4 // - 4
x/2-(x/5)-4 = 0
3/10*x-4 = 0 // + 4
3/10*x = 4 // : 3/10
x = 4/3/10
x = 40/3
x = 40/3
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