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5(-4+10x)=280
We move all terms to the left:
5(-4+10x)-(280)=0
We add all the numbers together, and all the variables
5(10x-4)-280=0
We multiply parentheses
50x-20-280=0
We add all the numbers together, and all the variables
50x-300=0
We move all terms containing x to the left, all other terms to the right
50x=300
x=300/50
x=6
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