Question

Find the missing number so that the equation has infinitely many solutions. 2x + _ = 2x - 4

Answer 1

• The missing number is -4.

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For the equation to have infinitely many solutions, the variables and constants should cancel and should end up with 0 = 0. It means for any value of the variable the equation is true, i.e. both sides are equal.

Given equation:

• 2x + ? = 2x - 4

If we solve it for ? we'll get:

• ? = - 4