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x+6+3=4x+3+3x
We move all terms to the left:
x+6+3-(4x+3+3x)=0
We add all the numbers together, and all the variables
x-(7x+3)+6+3=0
We add all the numbers together, and all the variables
x-(7x+3)+9=0
We get rid of parentheses
x-7x-3+9=0
We add all the numbers together, and all the variables
-6x+6=0
We move all terms containing x to the left, all other terms to the right
-6x=-6
x=-6/-6
x=1
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