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4.99+0.65a=6.49+0.40
We move all terms to the left:
4.99+0.65a-(6.49+0.40)=0
We add all the numbers together, and all the variables
0.65a+4.99-(6.89)=0
We add all the numbers together, and all the variables
0.65a-1.9=0
We move all terms containing a to the left, all other terms to the right
0.65a=1.9
a=1.9/0.65
a=2+0.6/0.65
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