15=30+7x-4x

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Solution for 15=30+7x-4x equation: 



15=30+7x-4x

We move all terms to the left:

15-(30+7x-4x)=0

We add all the numbers together, and all the variables

-(3x+30)+15=0

We get rid of parentheses

-3x-30+15=0

We add all the numbers together, and all the variables

-3x-15=0

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

-3x=15

x=15/-3

x=-5

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