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x in (-oo:+oo)
x+7/2 = (2/5)*x+9/10-(2/5)+1 // - (2/5)*x+9/10-(2/5)+1
x-((2/5)*x)+7/2-(9/10)+2/5-1 = 0
x+(-2/5)*x+7/2-9/10+2/5-1 = 0
3/5*x+2 = 0 // - 2
3/5*x = -2 // : 3/5
x = -2/3/5
x = -10/3
x = -10/3
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