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Let n be the unknown number then we can write :
7(4 + n) = -14
Clearing the brackets/parentheses
28 + 7n = -14
Subtract 28 from both sides
7n = -14 - 28 = -42
Divide both sides by 7
n = -6
Check : 7[4 + (-6)] = 7 x (-2) = -14
using algebra, this can be written as 7(2N+2) 14n+14. 14 times the number plus 14.
It is 5n + 14.
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X+14 ≤ 3x
14+a