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