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x in (-oo:+oo)
x/4 = 12/7 // - 12/7
x/4-(12/7) = 0
x/4-12/7 = 0
1/4*x-12/7 = 0 // + 12/7
1/4*x = 12/7 // : 1/4
x = 12/7/1/4
x = 48/7
x = 48/7
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