3x+15=4x-40

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Solution for 3x+15=4x-40 equation: 



3x+15=4x-40

We move all terms to the left:

3x+15-(4x-40)=0

We get rid of parentheses

3x-4x+40+15=0

We add all the numbers together, and all the variables

-1x+55=0

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

-x=-55

x=-55/-1

x=+55

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