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-6-\left(-4-a\right)=3a+6
Multiply both sides of the equation by 3.
-6-\left(-4\right)-\left(-a\right)=3a+6
To find the opposite of -4-a, find the opposite of each term.
-6+4-\left(-a\right)=3a+6
The opposite of -4 is 4.
-6+4+a=3a+6
The opposite of -a is a.
-2+a=3a+6
Add -6 and 4 to get -2.
-2+a-3a=6
Subtract 3a from both sides.
-2-2a=6
Combine a and -3a to get -2a.
-2a=6+2
Add 2 to both sides.
-2a=8
Add 6 and 2 to get 8.
a=\frac{8}{-2}
Divide both sides by -2.
a=-4
Divide 8 by -2 to get -4.