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x in (-oo:+oo)
x/2+x+5 = 7/10 // - 7/10
x/2+x-(7/10)+5 = 0
x/2+x-7/10+5 = 0
3/2*x+43/10 = 0 // - 43/10
3/2*x = -43/10 // : 3/2
x = -43/10/3/2
x = -43/15
x = -43/15
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