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187a+265=-456a-378
We simplify the equation to the form, which is simple to understand
187a+265=-456a-378
We move all terms containing a to the left and all other terms to the right.
+187a+456a=-378-265
We simplify left and right side of the equation.
+643a=-643
We divide both sides of the equation by 643 to get a.
a=-1
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