x+45=3x+135

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Solution for x+45=3x+135 equation: 



x+45=3x+135

We move all terms to the left:

x+45-(3x+135)=0

We get rid of parentheses

x-3x-135+45=0

We add all the numbers together, and all the variables

-2x-90=0

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

-2x=90

x=90/-2

x=-45

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