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-15
If: x+10 = 25 Then: x = 15
5x+15 = 6x-10 5x-6x = -10-15 -x = -25 x = 25
5x+25=10 5x+25-25=10-25 5x=-15 5x/5=-15/5 x=-3
5n+15 = 25 5n = 25-15 5n = 10 n = 2