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50x=100-40x
We move all terms to the left:
50x-(100-40x)=0
We add all the numbers together, and all the variables
50x-(-40x+100)=0
We get rid of parentheses
50x+40x-100=0
We add all the numbers together, and all the variables
90x-100=0
We move all terms containing x to the left, all other terms to the right
90x=100
x=100/90
x=1+1/9
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