Solve for a -7=8a+5+4a

Math
-7=8a+5+4a
Rewrite the equation as 8a+5+4a=-7.
8a+5+4a=-7
Add 8a and 4a.
12a+5=-7
Move all terms not containing a to the right side of the equation.
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Subtract 5 from both sides of the equation.
12a=-7-5
Subtract 5 from -7.
12a=-12
12a=-12
Divide each term by 12 and simplify.
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Divide each term in 12a=-12 by 12.
12a12=-1212
Cancel the common factor of 12.
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Cancel the common factor.
12a12=-1212
Divide a by 1.
a=-1212
a=-1212
Divide -12 by 12.
a=-1
a=-1
Solve for a -7=8a+5+4a

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