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x in (-oo:+oo)
13/5 = (26*x)/5-((-9*x)/5)+3/5 // - (26*x)/5-((-9*x)/5)+3/5
(-9*x)/5-((26*x)/5)+13/5-(3/5) = 0
(-26/5)*x+(-9*x)/5+13/5-3/5 = 0
2-7*x = 0 // - 2
-7*x = -2 // : -7
x = -2/(-7)
x = 2/7
x = 2/7
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