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a in (-oo:+oo)
(2/3)*a+3/4 = -13/4 // + -13/4
(2/3)*a+3/4-(-13/4) = 0
(2/3)*a+3/4+13/4 = 0
2/3*a+4 = 0 // - 4
2/3*a = -4 // : 2/3
a = -4/2/3
a = -6
a = -6
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