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n in (-oo:+oo)
3*n+3 = 4*n+10 // - 4*n+10
3*n-(4*n)-10+3 = 0
3*n-4*n-10+3 = 0
-n-7 = 0 // + 7
-n = 7 // * -1
n = -7
n = -7
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