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x in (-oo:+oo)
(6-x)/3+2*x = -3 // + 3
(6-x)/3+2*x+3 = 0
(6-x)/3+(2*3*x)/3+(3^2)/3 = 0
2*3*x-x+6+9 = 0
5*x+6+9 = 0
5*x+15 = 0
(5*x+15)/3 = 0
(5*x+15)/3 = 0 // * 3
5*x+15 = 0
5*x+15 = 0 // - 15
5*x = -15 // : 5
x = -15/5
x = -3
x = -3
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