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5x+35(440-x)=1780
We move all terms to the left:
5x+35(440-x)-(1780)=0
We add all the numbers together, and all the variables
5x+35(-1x+440)-1780=0
We multiply parentheses
5x-35x+15400-1780=0
We add all the numbers together, and all the variables
-30x+13620=0
We move all terms containing x to the left, all other terms to the right
-30x=-13620
x=-13620/-30
x=+454
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