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30=10+5x
We move all terms to the left:
30-(10+5x)=0
We add all the numbers together, and all the variables
-(5x+10)+30=0
We get rid of parentheses
-5x-10+30=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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