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x in (-oo:+oo)
(3*x)/4 = 18/4 // - 18/4
(3*x)/4-(18/4) = 0
(3*x)/4-9/2 = 0
3/4*x-9/2 = 0 // + 9/2
3/4*x = 9/2 // : 3/4
x = 9/2/3/4
x = 6
x = 6
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