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x in (-oo:+oo)
(-2/3)*x+3 = -9 // + 9
(-2/3)*x+3+9 = 0
12-2/3*x = 0 // - 12
-2/3*x = -12 // : -2/3
x = -12/(-2/3)
x = 18
x = 18
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