123=3x-15

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Solution for 123=3x-15 equation: 



123=3x-15

We move all terms to the left:

123-(3x-15)=0

We get rid of parentheses

-3x+15+123=0

We add all the numbers together, and all the variables

-3x+138=0

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

-3x=-138

x=-138/-3

x=+46

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