To solve the equation 2x-7=15 you first need to add seven to both sides so that the equation reads: 2x=15+7. You add seven because you have to isolate the x. Also because the 7 is negative (2x-7=15)
so to get to 2x+0 you need to add seven.
Then combine like terms. In this case the like terms are 7 and 15.
After that is done, the problem reads : 2x=22. Since there are two xs, and the xs are equal, you need to divide both sides by two.
when 22 (15 +7) is divided by two the answer is 1 1. so x=1 1
1) 2x-7 = 15
2) 2x-2 + 15
+7 +7
3) 2x =15+7
4) 2x=22
5) 2x=22
2 2
6) x= 1 1
so to get to 2x+0 you need to add seven.
Then combine like terms. In this case the like terms are 7 and 15.
After that is done, the problem reads : 2x=22. Since there are two xs, and the xs are equal, you need to divide both sides by two.
when 22 (15 +7) is divided by two the answer is 1 1. so x=1 1
1) 2x-7 = 15
2) 2x-2 + 15
+7 +7
3) 2x =15+7
4) 2x=22
5) 2x=22
2 2
6) x= 1 1