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n in (-oo:+oo)
2*(10-(7*n)) = -50 // + 50
2*(10-(7*n))+50 = 0
2*(10-7*n)+50 = 0
2*(10-7*n)+50 = 0
70-14*n = 0
70-14*n = 0
70-14*n = 0 // - 70
-14*n = -70 // : -14
n = -70/(-14)
n = 5
n = 5
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