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n in (-oo:+oo)
5*(2*n-4) = -70 // + 70
5*(2*n-4)+70 = 0
5*(2*n-4)+70 = 0
10*n+50 = 0
10*n+50 = 0
10*n+50 = 0 // - 50
10*n = -50 // : 10
n = -50/10
n = -5
n = -5
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