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x in (-oo:+oo)
(2/9)*x-3 = 4 // - 4
(2/9)*x-4-3 = 0
2/9*x-7 = 0 // + 7
2/9*x = 7 // : 2/9
x = 7/2/9
x = 63/2
x = 63/2
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