dr.math: What grade are you in? what are you covering in math? Spark plug: 7 dr.math: grade 7? Spark plug: yes dr.math: are u doing "pre algebra" stuff like What is the value of X if x + 3 = 10? Spark plug: yes dr.math: ok, so what is the value of x if x + 3 = 10? Spark plug: 7 dr.math: ok. how about (15 x 2 ) + x = 35 Spark plug: 5 dr.math: (I am going to use * for multiply so not to confuse it with x, ok?) Spark plug: ok dr.math: (2 * x) + 8 = 18 Spark plug: 5 dr.math: very good. can you explain to me how you figured that out? Spark plug: 18 - 8 is 10 so 2* what is 10 and the answer is 5 dr.math: Excellent.