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-49=7(7--7a)
We simplify the equation to the form, which is simple to understand
-49=7(7+7a)
Reorder the terms in parentheses
-49=+(+49+49a)
Remove unnecessary parentheses
-49=+49+49a
We move all terms containing a to the left and all other terms to the right.
-49a=+49+49
We simplify left and right side of the equation.
-49a=+98
We divide both sides of the equation by -049 to get a.
a=-2
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