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x in (-oo:+oo)
-15 = -((4/9)*x)-3 // + -((4/9)*x)-3
(4/9)*x-15+3 = 0
4/9*x-12 = 0 // + 12
4/9*x = 12 // : 4/9
x = 12/4/9
x = 27
x = 27
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