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0.01(a+4)-0.02(-2a+4)=0.12
We move all terms to the left:
0.01(a+4)-0.02(-2a+4)-(0.12)=0
We add all the numbers together, and all the variables
0.01(a+4)-0.02(-2a+4)-0.12=0
We multiply parentheses
0.01a+0.04a+0.04-0.08-0.12=0
We add all the numbers together, and all the variables
0.05a-0.16=0
We move all terms containing a to the left, all other terms to the right
0.05a=0.16
a=0.16/0.05
a=3+0.01/0.05
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