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a in (-oo:+oo)
(2-(3*a))/4 = 5 // - 5
(2-(3*a))/4-5 = 0
(2-3*a)/4-5 = 0
(2-3*a)/4+(-5*4)/4 = 0
2-3*a-5*4 = 0
-3*a-18 = 0
(-3*a-18)/4 = 0
(-3*a-18)/4 = 0 // * 4
-3*a-18 = 0
-3*a-18 = 0 // + 18
-3*a = 18 // : -3
a = 18/(-3)
a = -6
a = -6
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