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a in (-oo:+oo)
(2/3)*a-1/3 = -3/4 // + -3/4
(2/3)*a-1/3-(-3/4) = 0
(2/3)*a-1/3+3/4 = 0
2/3*a+5/12 = 0 // - 5/12
2/3*a = -5/12 // : 2/3
a = -5/12/2/3
a = -5/8
a = -5/8
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