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5400=7x-1400
We move all terms to the left:
5400-(7x-1400)=0
We get rid of parentheses
-7x+1400+5400=0
We add all the numbers together, and all the variables
-7x+6800=0
We move all terms containing x to the left, all other terms to the right
-7x=-6800
x=-6800/-7
x=971+3/7
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