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140(x-1)=100x
We move all terms to the left:
140(x-1)-(100x)=0
We add all the numbers together, and all the variables
-100x+140(x-1)=0
We multiply parentheses
-100x+140x-140=0
We add all the numbers together, and all the variables
40x-140=0
We move all terms containing x to the left, all other terms to the right
40x=140
x=140/40
x=3+1/2
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