-7 = 2n + 19
Subtract 19 from both side
-26 = 2n
Divide by 2 on both sides
n = -13
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2n + 19 = -7 2n = -7 - 19 2n = -26 n= -13
3n + 2n = 25 5n = 25 n = 5
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 + 8 = -142n = -22n = -11
9 - 5n