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x+3=13+6x
We move all terms to the left:
x+3-(13+6x)=0
We add all the numbers together, and all the variables
x-(6x+13)+3=0
We get rid of parentheses
x-6x-13+3=0
We add all the numbers together, and all the variables
-5x-10=0
We move all terms containing x to the left, all other terms to the right
-5x=10
x=10/-5
x=-2
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