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