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x in (-oo:+oo)
(3/4)*x = 1.5 // - 1.5
(3/4)*x-1.5 = 0
3/4*x-1.5 = 0 // + 1.5
3/4*x = 1.5 // : 3/4
x = 1.5/3/4
x = 2
x = 2
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