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40=x-7-4+x
We move all terms to the left:
40-(x-7-4+x)=0
We add all the numbers together, and all the variables
-(2x-11)+40=0
We get rid of parentheses
-2x+11+40=0
We add all the numbers together, and all the variables
-2x+51=0
We move all terms containing x to the left, all other terms to the right
-2x=-51
x=-51/-2
x=25+1/2
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