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5a+2(1.25-0.75a)=6
We move all terms to the left:
5a+2(1.25-0.75a)-(6)=0
We add all the numbers together, and all the variables
5a+2(-0.75a+1.25)-6=0
We multiply parentheses
5a+0a+2.5-6=0
We add all the numbers together, and all the variables
6a-3.5=0
We move all terms containing a to the left, all other terms to the right
6a=3.5
a=3.5/6
a=1/1.7142857142857
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