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40=5x-2+x+12
We move all terms to the left:
40-(5x-2+x+12)=0
We add all the numbers together, and all the variables
-(6x+10)+40=0
We get rid of parentheses
-6x-10+40=0
We add all the numbers together, and all the variables
-6x+30=0
We move all terms containing x to the left, all other terms to the right
-6x=-30
x=-30/-6
x=+5
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