7(x + 1) = 63
That is the equations of the words above. The simplified version is:
7(x + 1) = 63
7x + 7 = 63 (multiplied 7 by x and the 7 by 1)
- 7 -7
-----------------
7x = 63
---- ---- (divide by seven to leave the variable, in this case the letter x, alone)
7 7
x = 9 (63/7 = 9)