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x in (-oo:+oo)
x/7+(2*x)/4 = 9/7 // - 9/7
x/7+(2*x)/4-(9/7) = 0
x/7+(2*x)/4-9/7 = 0
9/14*x-9/7 = 0 // + 9/7
9/14*x = 9/7 // : 9/14
x = 9/7/9/14
x = 2
x = 2
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