7x-20=5x-100

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Solution for 7x-20=5x-100 equation: 



7x-20=5x-100

We move all terms to the left:

7x-20-(5x-100)=0

We get rid of parentheses

7x-5x+100-20=0

We add all the numbers together, and all the variables

2x+80=0

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

2x=-80

x=-80/2

x=-40

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