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30=10x+5x
We move all terms to the left:
30-(10x+5x)=0
We add all the numbers together, and all the variables
-(+15x)+30=0
We get rid of parentheses
-15x+30=0
We move all terms containing x to the left, all other terms to the right
-15x=-30
x=-30/-15
x=+2
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