-18=7x+15-4x

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Solution for -18=7x+15-4x equation: 



-18=7x+15-4x

We move all terms to the left:

-18-(7x+15-4x)=0

We add all the numbers together, and all the variables

-(3x+15)-18=0

We get rid of parentheses

-3x-15-18=0

We add all the numbers together, and all the variables

-3x-33=0

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

-3x=33

x=33/-3

x=-11

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