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n in (-oo:+oo)
7*n-((2/3)*n)-3 = -31/4 // + -31/4
7*n-((2/3)*n)-(-31/4)-3 = 0
7*n+(-2/3)*n+31/4-3 = 0
19/3*n+19/4 = 0 // - 19/4
19/3*n = -19/4 // : 19/3
n = -19/4/19/3
n = -3/4
n = -3/4
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