-15=90-3x

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Solution for -15=90-3x equation: 



-15=90-3x

We move all terms to the left:

-15-(90-3x)=0

We add all the numbers together, and all the variables

-(-3x+90)-15=0

We get rid of parentheses

3x-90-15=0

We add all the numbers together, and all the variables

3x-105=0

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

3x=105

x=105/3

x=35

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