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x in (-oo:+oo)
x/7 = 4/3 // - 4/3
x/7-(4/3) = 0
x/7-4/3 = 0
1/7*x-4/3 = 0 // + 4/3
1/7*x = 4/3 // : 1/7
x = 4/3/1/7
x = 28/3
x = 28/3
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