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