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x in (-oo:+oo)
3/15-(3*x) = (7/2)*x // - (7/2)*x
3/15-(3*x)-((7/2)*x) = 0
(-7/2)*x-3*x+3/15 = 0
1/5-13/2*x = 0 // - 1/5
-13/2*x = -1/5 // : -13/2
x = -1/5/(-13/2)
x = 2/65
x = 2/65
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