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3x+75=6x-30
We move all terms to the left:
3x+75-(6x-30)=0
We get rid of parentheses
3x-6x+30+75=0
We add all the numbers together, and all the variables
-3x+105=0
We move all terms containing x to the left, all other terms to the right
-3x=-105
x=-105/-3
x=+35
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