Solve for a
a=-10
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-a+2a+7=-3
Subtract 3 from 0 to get -3.
-a+2a=-3-7
Subtract 7 from both sides.
-a+2a=-10
Subtract 7 from -3 to get -10.
a=-10
Combine -a and 2a to get a.
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Matrix
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