An equation tells us about the numeric relationship between quantities. For example, say we have two boxes of balls and we know that there are 10 more balls in the one box than in the other. Let's use \(x\) to indicate the number of balls in the first box. Then there are \(x+10\) balls in the second box. To find the total number of balls we can make an equation: Total \(=x+(x+10)\), which gives: Total \(=2 x+10\). If we know that there are 46 balls altogether, then we can say \(2 x+10=46\). When we solve this equation, we get \(x=18\). So we know there are 18 balls in one box and 28 balls in the other.