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-x-3=5x+123
We move all terms to the left:
-x-3-(5x+123)=0
We add all the numbers together, and all the variables
-1x-(5x+123)-3=0
We get rid of parentheses
-1x-5x-123-3=0
We add all the numbers together, and all the variables
-6x-126=0
We move all terms containing x to the left, all other terms to the right
-6x=126
x=126/-6
x=-21
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