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17x-140=280+7x
We move all terms to the left:
17x-140-(280+7x)=0
We add all the numbers together, and all the variables
17x-(7x+280)-140=0
We get rid of parentheses
17x-7x-280-140=0
We add all the numbers together, and all the variables
10x-420=0
We move all terms containing x to the left, all other terms to the right
10x=420
x=420/10
x=42
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