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n in (-oo:+oo)
2*n+7/10 = -13/10 // + -13/10
2*n+7/10-(-13/10) = 0
2*n+7/10+13/10 = 0
2*n+2 = 0 // - 2
2*n = -2 // : 2
n = -2/2
n = -1
n = -1
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