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x in (-oo:+oo)
(3*x)/4+(7*x)/8 = 51 // - 51
(3*x)/4+(7*x)/8-51 = 0
13/8*x-51 = 0 // + 51
13/8*x = 51 // : 13/8
x = 51/13/8
x = 408/13
x = 408/13
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