40-5x=140

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Solution for 40-5x=140 equation: 



40-5x=140

We move all terms to the left:

40-5x-(140)=0

We add all the numbers together, and all the variables

-5x-100=0

We move all terms containing x to the left, all other terms to the right

-5x=100

x=100/-5

x=-20

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