Answer :
The missing number that will make the equation to have infinitely many solutions would be = -17.
What is an infinite many solutions?
An infinite many solutions occurs when the terms on both sides of the equal sign of an equation are the same. That is;
3=3 or
3x = 3x.
But if we end up with different numbers on either side of the equal sign, as in 4 = 5, then we have no solutions.
From the equation given such as follows;
2x-17 = 2x+ ?
The missing value can only be= -17 as it will cancel out the plus sign.
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