75=30-x

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Solution for 75=30-x equation: 



75=30-x

We move all terms to the left:

75-(30-x)=0

We add all the numbers together, and all the variables

-(-1x+30)+75=0

We get rid of parentheses

1x-30+75=0

We add all the numbers together, and all the variables

x+45=0

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

x=-45

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