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0.5a+0.12(a+1)=5.7
We move all terms to the left:
0.5a+0.12(a+1)-(5.7)=0
We add all the numbers together, and all the variables
0.5a+0.12(a+1)-5.7=0
We multiply parentheses
0.5a+0.12a+0.12-5.7=0
We add all the numbers together, and all the variables
0.62a-5.58=0
We move all terms containing a to the left, all other terms to the right
0.62a=5.58
a=5.58/0.62
a=9
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