The missing number so that the equation has no solutions is -7/3.
The equation given is represented by:
x+1 = -2x–6
It should be noted that we just have to find the value of x. This will be
x+1 = -2x–6
x + 2x = -6 - 1
3x = -7
x = -7/3
Therefore, the value of x is -7/3.
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