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n in (-oo:+oo)
(-3/4)*n+4/7 = 4/7 // - 4/7
(-3/4)*n+4/7-(4/7) = 0
(-3/4)*n+4/7-4/7 = 0
-3/4*n = 0 // : -3/4
n = 0
n = 0
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