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a in (-oo:+oo)
(2/3)*a+4 = -2/3 // + -2/3
(2/3)*a-(-2/3)+4 = 0
(2/3)*a+2/3+4 = 0
2/3*a+14/3 = 0 // - 14/3
2/3*a = -14/3 // : 2/3
a = -14/3/2/3
a = -7
a = -7
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