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27.7=-3.2a
We move all terms to the left:
27.7-(-3.2a)=0
We get rid of parentheses
3.2a+27.7=0
We move all terms containing a to the left, all other terms to the right
3.2a=-27.7
a=-27.7/3.2
a=-8+2.1/3.2
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