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x in (-oo:+oo)
(1/3)*x+7/10 = x+13/15 // - x+13/15
(1/3)*x-x+7/10-(13/15) = 0
(1/3)*x-x+7/10-13/15 = 0
-2/3*x-1/6 = 0 // + 1/6
-2/3*x = 1/6 // : -2/3
x = 1/6/(-2/3)
x = -1/4
x = -1/4
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