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x in (-oo:+oo)
(2/3)*x-3 = 3/4 // - 3/4
(2/3)*x-(3/4)-3 = 0
(2/3)*x-3/4-3 = 0
2/3*x-15/4 = 0 // + 15/4
2/3*x = 15/4 // : 2/3
x = 15/4/2/3
x = 45/8
x = 45/8
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