0
3a + 11 = 7a - 13
subtract 3a from each side
3a - 3a + 11 = 7a - 3a - 13
11 = 4a - 13
add 13 to each side
11 + 13 = 4a - 13 + 13
24 = 4a
divide each sides integer by 4
24/4 = (4/4)a
6 = a
-------------check in original equation
3(6) + 11 = 7(6) - 13
18 + 11 = 42 - 13
29 = 29
----------------checks out
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