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x in (-oo:+oo)
x/5+x/2 = 7/10 // - 7/10
x/5+x/2-(7/10) = 0
x/5+x/2-7/10 = 0
7/10*x-7/10 = 0 // + 7/10
7/10*x = 7/10 // : 7/10
x = 7/10/7/10
x = 1
x = 1
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