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30=2x+3x+5x
We move all terms to the left:
30-(2x+3x+5x)=0
We add all the numbers together, and all the variables
-(+10x)+30=0
We get rid of parentheses
-10x+30=0
We move all terms containing x to the left, all other terms to the right
-10x=-30
x=-30/-10
x=+3
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