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x in (-oo:+oo)
(1/3)*(-6*x-9) = -3*x-(2*x)-15 // + -3*x-(2*x)-15
(1/3)*(-6*x-9)-(-3*x)+2*x+15 = 0
(1/3)*(-6*x-9)+3*x+2*x+15 = 0
1/3*(-6*x-9)+3*x+2*x+15 = 0
1/3*(-6*x-9)+3*x+2*x+15 = 0
x+2*x-3+15 = 0
3*x-3+15 = 0
3*x+12 = 0
3*x+12 = 0
3*x+12 = 0 // - 12
3*x = -12 // : 3
x = -12/3
x = -4
x = -4
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