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7a+4=0
We simplify the equation to the form, which is simple to understand
7a+4=0
We move all terms containing a to the left and all other terms to the right.
+7a=0-4
We simplify left and right side of the equation.
+7a=-4
We divide both sides of the equation by 7 to get a.
a=-0.571428571429
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