2n+5
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3.4
let x be the number, then: (x + 1) × 2 + 5 = x + 1 → 2x + 2 + 5 = x + 1 → 2x + 7 = x + 1 → 2x - x = 1 - 7 → x = -6 The number is -6. Checking: -6 +1 = -5; 5 × 2 = -10; -10 + 5 = -5 which is the same as -6 + 1 = -5.
x+5 = 7 - (2x) 3x = 2 x = 2/3 The number is 2/3
You can write 5 and 2/3 into a mixed number just as I have done.
28 .5 x 28= 14 14 + 2= 16