x+45=3x-87

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Solution for x+45=3x-87 equation: 



x+45=3x-87

We move all terms to the left:

x+45-(3x-87)=0

We get rid of parentheses

x-3x+87+45=0

We add all the numbers together, and all the variables

-2x+132=0

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

-2x=-132

x=-132/-2

x=+66

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