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