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87=8x-5x
We move all terms to the left:
87-(8x-5x)=0
We add all the numbers together, and all the variables
-(+3x)+87=0
We get rid of parentheses
-3x+87=0
We move all terms containing x to the left, all other terms to the right
-3x=-87
x=-87/-3
x=+29
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