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100/140=x
We move all terms to the left:
100/140-(x)=0
We add all the numbers together, and all the variables
-1x+100/140=0
We multiply all the terms by the denominator
-1x*140+100=0
Wy multiply elements
-140x+100=0
We move all terms containing x to the left, all other terms to the right
-140x=-100
x=-100/-140
x=5/7
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