You can put this solution on YOUR website! Distribute the negative and the -2
-a - 3 = -2(2a) - 2(1) - 7
...
-a - 3 = -4a - 2 - 7
...
Group a variables ot one side of the equation
-a + 4a = -2 - 7 + 3
3a = -6
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