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-987x-564+55x-123+78=-987x+258-25x+478+255
We move all terms to the left:
-987x-564+55x-123+78-(-987x+258-25x+478+255)=0
We add all the numbers together, and all the variables
-987x+55x-(-1012x+991)-564-123+78=0
We add all the numbers together, and all the variables
-932x-(-1012x+991)-609=0
We get rid of parentheses
-932x+1012x-991-609=0
We add all the numbers together, and all the variables
80x-1600=0
We move all terms containing x to the left, all other terms to the right
80x=1600
x=1600/80
x=20
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