123=7x+3

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Solution for 123=7x+3 equation: 



123=7x+3

We move all terms to the left:

123-(7x+3)=0

We get rid of parentheses

-7x-3+123=0

We add all the numbers together, and all the variables

-7x+120=0

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

-7x=-120

x=-120/-7

x=17+1/7

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