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n in (-oo:+oo)
2/3-((5/7)*n) = 74/21 // - 74/21
2/3-((5/7)*n)-(74/21) = 0
(-5/7)*n+2/3-74/21 = 0
-5/7*n-20/7 = 0 // + 20/7
-5/7*n = 20/7 // : -5/7
n = 20/7/(-5/7)
n = -4
n = -4
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