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6.4x+7=3.2x+15
We move all terms to the left:
6.4x+7-(3.2x+15)=0
We get rid of parentheses
6.4x-3.2x-15+7=0
We add all the numbers together, and all the variables
3.2x-8=0
We move all terms containing x to the left, all other terms to the right
3.2x=8
x=8/3.2
x=2+1/2
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