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65x+35(x-1)=390
We move all terms to the left:
65x+35(x-1)-(390)=0
We multiply parentheses
65x+35x-35-390=0
We add all the numbers together, and all the variables
100x-425=0
We move all terms containing x to the left, all other terms to the right
100x=425
x=425/100
x=4+1/4
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