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a in (-oo:+oo)
(2*a)/3-4-3 = -2/3 // + -2/3
(2*a)/3-(-2/3)-4-3 = 0
(2*a)/3+2/3-4-3 = 0
2/3*a-19/3 = 0 // + 19/3
2/3*a = 19/3 // : 2/3
a = 19/3/2/3
a = 19/2
a = 19/2
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