The value of x for the given condition will be either 1/9 or -1/9.
What are summation and multiplication?
A summation, also abbreviated as a sum, is the outcome of adding two or more numbers or quantities. Here are always an integer number of terms in a summation.
Multiplication is the general procedure in mathematics in which we multiply two or more numbers to each other to find a new multiplied number.
Given that 3 + x × (-9) = 4
In the first case if the value of x is positive
3 - 9x = 4 ⇒ x = -1/9
In the second case if the value of x is negative
3 + 9x = 4 ⇒ x = 1/9
For more information about summation
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