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-3x+30=3x+6
We move all terms to the left:
-3x+30-(3x+6)=0
We get rid of parentheses
-3x-3x-6+30=0
We add all the numbers together, and all the variables
-6x+24=0
We move all terms containing x to the left, all other terms to the right
-6x=-24
x=-24/-6
x=+4
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