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0.666a+0.888a=-19
We move all terms to the left:
0.666a+0.888a-(-19)=0
We add all the numbers together, and all the variables
1.554a+19=0
We move all terms containing a to the left, all other terms to the right
1.554a=-19
a=-19/1.554
a=-12+0.352/1.554
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