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x in (-oo:+oo)
(2/3)*x+4 = 5 // - 5
(2/3)*x-5+4 = 0
2/3*x-1 = 0 // + 1
2/3*x = 1 // : 2/3
x = 1/2/3
x = 3/2
x = 3/2
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