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40=13x-6x-2
We move all terms to the left:
40-(13x-6x-2)=0
We add all the numbers together, and all the variables
-(7x-2)+40=0
We get rid of parentheses
-7x+2+40=0
We add all the numbers together, and all the variables
-7x+42=0
We move all terms containing x to the left, all other terms to the right
-7x=-42
x=-42/-7
x=+6
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