45=12-3*x

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Solution for 45=12-3*x equation: 



45=12-3x

We move all terms to the left:

45-(12-3x)=0

We add all the numbers together, and all the variables

-(-3x+12)+45=0

We get rid of parentheses

3x-12+45=0

We add all the numbers together, and all the variables

3x+33=0

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

3x=-33

x=-33/3

x=-11

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