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x in (-oo:+oo)
(3*x)/4 = 36/12 // - 36/12
(3*x)/4-(36/12) = 0
(3*x)/4-3 = 0
3/4*x-3 = 0 // + 3
3/4*x = 3 // : 3/4
x = 3/3/4
x = 4
x = 4
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