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-40-x=-4x+28
We move all terms to the left:
-40-x-(-4x+28)=0
We add all the numbers together, and all the variables
-1x-(-4x+28)-40=0
We get rid of parentheses
-1x+4x-28-40=0
We add all the numbers together, and all the variables
3x-68=0
We move all terms containing x to the left, all other terms to the right
3x=68
x=68/3
x=22+2/3
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