4x+18=7x-21

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Solution for 4x+18=7x-21 equation: 



4x+18=7x-21

We move all terms to the left:

4x+18-(7x-21)=0

We get rid of parentheses

4x-7x+21+18=0

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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