-30+7x=4x+57

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Solution for -30+7x=4x+57 equation: 



-30+7x=4x+57

We move all terms to the left:

-30+7x-(4x+57)=0

We get rid of parentheses

7x-4x-57-30=0

We add all the numbers together, and all the variables

3x-87=0

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

3x=87

x=87/3

x=29

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