You can put this solution on YOUR website! 3a - 15 + 19 = -2
do the math
3a + 4 = -2
subtract 4 from both sides
3a + 4 - 4 = -2 - 4
do the math
3a = -6
Divide both sides by 3
a = -6/3
a = -2
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Check this in the original problem, replace a with -2
3(-2) - 15 + 19 = -2
-6 - 15 + 19 = -2
-2 = -2, confirms our solution of a = -2
