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40=10x+30
We move all terms to the left:
40-(10x+30)=0
We get rid of parentheses
-10x-30+40=0
We add all the numbers together, and all the variables
-10x+10=0
We move all terms containing x to the left, all other terms to the right
-10x=-10
x=-10/-10
x=1
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