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-20-7x=-28-3x
We move all terms to the left:
-20-7x-(-28-3x)=0
We add all the numbers together, and all the variables
-7x-(-3x-28)-20=0
We get rid of parentheses
-7x+3x+28-20=0
We add all the numbers together, and all the variables
-4x+8=0
We move all terms containing x to the left, all other terms to the right
-4x=-8
x=-8/-4
x=+2
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