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3x+30=4x-5
We move all terms to the left:
3x+30-(4x-5)=0
We get rid of parentheses
3x-4x+5+30=0
We add all the numbers together, and all the variables
-1x+35=0
We move all terms containing x to the left, all other terms to the right
-x=-35
x=-35/-1
x=+35
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