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x in (-oo:+oo)
9-(3*x) = -5*x-3 // + -5*x-3
3-(3*x)-(-5*x)+9 = 0
5*x-3*x+3+9 = 0
2*x+12 = 0 // - 12
2*x = -12 // : 2
x = -12/2
x = -6
x = -6
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