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10x+5(139-x)=935
We move all terms to the left:
10x+5(139-x)-(935)=0
We add all the numbers together, and all the variables
10x+5(-1x+139)-935=0
We multiply parentheses
10x-5x+695-935=0
We add all the numbers together, and all the variables
5x-240=0
We move all terms containing x to the left, all other terms to the right
5x=240
x=240/5
x=48
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