100+7x=12x-100

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Solution for 100+7x=12x-100 equation: 



100+7x=12x-100

We move all terms to the left:

100+7x-(12x-100)=0

We get rid of parentheses

7x-12x+100+100=0

We add all the numbers together, and all the variables

-5x+200=0

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

-5x=-200

x=-200/-5

x=+40

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