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x=7/10(220-40)
We move all terms to the left:
x-(7/10(220-40))=0
We add all the numbers together, and all the variables
x-(7/10180)=0
We get rid of parentheses
x-7/10180=0
We multiply all the terms by the denominator
x*10180-7=0
Wy multiply elements
10180x-7=0
We move all terms containing x to the left, all other terms to the right
10180x=7
x=7/10180
x=7/10180
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