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x in (-oo:+oo)
x-((2/5)*x) = 7/10 // - 7/10
x-((2/5)*x)-(7/10) = 0
x+(-2/5)*x-7/10 = 0
3/5*x-7/10 = 0 // + 7/10
3/5*x = 7/10 // : 3/5
x = 7/10/3/5
x = 7/6
x = 7/6
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