3n + 2n = 25
5n = 25
n = 5
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It is: 25+(2*13) = 51
The value of n is 12.5
-7 = 2n + 19 Subtract 19 from both side -26 = 2n Divide by 2 on both sides n = -13
You can't. 17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.
2n + 19 = -7 2n = -7 - 19 2n = -26 n= -13