3=x+90

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Solution for 3=x+90 equation: 



3=x+90

We move all terms to the left:

3-(x+90)=0

We get rid of parentheses

-x-90+3=0

We add all the numbers together, and all the variables

-1x-87=0

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

-x=87

x=87/-1

x=-87

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