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x in (-oo:+oo)
(3*x+9)/5 = 2*x+6 // - 2*x+6
(3*x+9)/5-(2*x)-6 = 0
(3*x+9)/5-2*x-6 = 0
(3*x+9)/5+(-2*5*x)/5+(-6*5)/5 = 0
3*x-2*5*x-6*5+9 = 0
9-7*x-30 = 0
-7*x-21 = 0
(-7*x-21)/5 = 0
(-7*x-21)/5 = 0 // * 5
-7*x-21 = 0
-7*x-21 = 0 // + 21
-7*x = 21 // : -7
x = 21/(-7)
x = -3
x = -3
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