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x in (-oo:+oo)
(x+3)/4 = (2*x+6)/3 // - (2*x+6)/3
(x+3)/4-((2*x+6)/3) = 0
(x+3)/4+(-1*(2*x+6))/3 = 0
(3*(x+3))/(3*4)+(-1*4*(2*x+6))/(3*4) = 0
3*(x+3)-1*4*(2*x+6) = 0
-5*x-15 = 0
(-5*x-15)/(3*4) = 0
(-5*x-15)/(3*4) = 0 // * 3*4
-5*x-15 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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