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a in (-oo:+oo)
-((2/3)*a)-9/10 = -11/15 // + -11/15
-((2/3)*a)-9/10-(-11/15) = 0
(-2/3)*a-9/10+11/15 = 0
-2/3*a-1/6 = 0 // + 1/6
-2/3*a = 1/6 // : -2/3
a = 1/6/(-2/3)
a = -1/4
a = -1/4
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