Hey can someone help me w this practice question

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

What is the value of x? enter your answer in the box. x =