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a in (-oo:+oo)
(-2/3)*(a+3) = (5/3)*a-19 // - (5/3)*a-19
(-2/3)*(a+3)-((5/3)*a)+19 = 0
(-2/3)*(a+3)+(-5/3)*a+19 = 0
(-5*a)/3-2/3*(a+3)+19 = 0
(-2/3*3*(a+3))/3+(-5*a)/3+(3*19)/3 = 0
3*19-2/3*3*(a+3)-5*a = 0
57-7*a-6 = 0
51-7*a = 0
(51-7*a)/3 = 0
(51-7*a)/3 = 0 // * 3
51-7*a = 0
51-7*a = 0 // - 51
-7*a = -51 // : -7
a = -51/(-7)
a = 51/7
a = 51/7
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