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x in (-oo:+oo)
(3*(x+3))/4 = 2*x-3 // - 2*x-3
(3*(x+3))/4-(2*x)+3 = 0
(3*(x+3))/4-2*x+3 = 0
(3*(x+3))/4+(-2*4*x)/4+(3*4)/4 = 0
3*(x+3)-2*4*x+3*4 = 0
9-5*x+12 = 0
21-5*x = 0
(21-5*x)/4 = 0
(21-5*x)/4 = 0 // * 4
21-5*x = 0
21-5*x = 0 // - 21
-5*x = -21 // : -5
x = -21/(-5)
x = 21/5
x = 21/5
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