10 -3x+8x = 25
-3x+8x = 25-10
5x = 15
x = 3
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138
3n + 2n = 25 5n = 25 n = 5
sixty is equal to 10 plus 50, and as 10 equals 50, and 50 equals 79, then it would be fair to assume that 60 equals 50 plus 79, which is 129.
28 plus 17 plus 25 plus 54 plus 20 plus 36 is equal to 180.
12 +12 does not equal 25. (It's 24 - test on a calculator if you like!).