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50.7=-3.9a
We move all terms to the left:
50.7-(-3.9a)=0
We get rid of parentheses
3.9a+50.7=0
We move all terms containing a to the left, all other terms to the right
3.9a=-50.7
a=-50.7/3.9
a=-13+7.105427357601E-15/3.9
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