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40-70x=10x+140
We move all terms to the left:
40-70x-(10x+140)=0
We get rid of parentheses
-70x-10x-140+40=0
We add all the numbers together, and all the variables
-80x-100=0
We move all terms containing x to the left, all other terms to the right
-80x=100
x=100/-80
x=-1+1/4
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