Identify the goal: Identify the goal. We need to find the value of 'a' in the equation 5 + a = 7. Isolate the variable: Isolate the variable 'a'. To isolate 'a', we need to subtract 5 from both sides of the equation to get 'a' by itself on one side. Perform the subtraction: Perform the subtraction. 5 + a - 5 = 7 - 5 This simplifies to: a = 2 Check the solution: Check the solution. We can check our solution by substituting 'a' back into the original equation to see if it holds true. 5 + 2 = 7 7 = 7 Since both sides of the equation are equal, our solution is correct.

Grade 7

Add and subtract fractions

Full solution

5+a=7

Identify the goal: Identify the goal. $\newline$ We need to find the value of $a$ in the equation $5 + a = 7$ .
Isolate the variable: Isolate the variable $a$ . To isolate $a$ , we need to subtract $5$ from both sides of the equation to get $a$ by itself on one side.
Perform the subtraction: Perform the subtraction. $\newline$ $5 + a - 5 = 7 - 5$ $\newline$ This simplifies to: $\newline$ $a = 2$
Check the solution: Check the solution. $\newline$ We can check our solution by substituting ' $a$ ' back into the original equation to see if it holds true. $\newline$ $5 + 2 = 7$ $\newline$ $7 = 7$ $\newline$ Since both sides of the equation are equal, our solution is correct.