45+(3x-12)=90

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Solution for 45+(3x-12)=90 equation: 



45+(3x-12)=90

We move all terms to the left:

45+(3x-12)-(90)=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-57=0

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

3x=57

x=57/3

x=19

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