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n in (-oo:+oo)
(1/2)*(4*n-6) = 7 // - 7
(1/2)*(4*n-6)-7 = 0
1/2*(4*n-6)-7 = 0
1/2*(4*n-6)-7 = 0
2*n-10 = 0
2*n-10 = 0
2*n-10 = 0 // + 10
2*n = 10 // : 2
n = 10/2
n = 5
n = 5
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