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0.5(12x+20)=70
We move all terms to the left:
0.5(12x+20)-(70)=0
We multiply parentheses
6x+10-70=0
We add all the numbers together, and all the variables
6x-60=0
We move all terms containing x to the left, all other terms to the right
6x=60
x=60/6
x=10
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