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10x+7(783-x)=6459
We move all terms to the left:
10x+7(783-x)-(6459)=0
We add all the numbers together, and all the variables
10x+7(-1x+783)-6459=0
We multiply parentheses
10x-7x+5481-6459=0
We add all the numbers together, and all the variables
3x-978=0
We move all terms containing x to the left, all other terms to the right
3x=978
x=978/3
x=326
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