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56.4=-4.7a
We move all terms to the left:
56.4-(-4.7a)=0
We get rid of parentheses
4.7a+56.4=0
We move all terms containing a to the left, all other terms to the right
4.7a=-56.4
a=-56.4/4.7
a=-12+-7.105427357601E-15/4.7
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