90=3x-7+7x-3

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Solution for 90=3x-7+7x-3 equation: 



90=3x-7+7x-3

We move all terms to the left:

90-(3x-7+7x-3)=0

We add all the numbers together, and all the variables

-(10x-10)+90=0

We get rid of parentheses

-10x+10+90=0

We add all the numbers together, and all the variables

-10x+100=0

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

-10x=-100

x=-100/-10

x=+10

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